I love HS! Great xp, great loot, lots of fun (especially for a chanter). I've spent a TON of time in there since the beginning of the year, so here's what I can think of to say about it on the fly:
The "door" into HS is a glowing orb thing in the bottom of the canyon in overthere, and the area near it is guarded by level 30-35ish shadowknight scorpionmen dudes who are on the same faction as the outpost (venril sathir).
When you zone into HS, you're standing in the middle of a square platform with stairs head up in each of the cardinal directions. The edge of the platform drops down into the "basement." There are two NPCs that wander around on the platform you zone in on who can aggro immediately depending on your timing of zoning in (luck). They can be undead (and that means they will harmtouch for about 400-450, but also that you can mana drain them with theft of thought... something which makes the whole zone awesome for enchanters) or alive (sperm dudes like you see in dalnir and kaesora and skyfire, which means they drop the key you need to zone into north). This can make it hard to zone in safely since you never really know if you need IVU or invis or both to avoid aggroing on zonein.
At the top of each of the 4 stairways is a locked door leading to one of the 4 wings of the dungeon. North, west, south, east is the difficulty order. Two golem mobs guard each door, and they are about level 43-45. The east stairway is a trap, you will fall through the stairs. The east door also in unlocked, and there is a pathing NPC that goes into and out of east and stands at the edge of the steps. He WILL aggro you if you are standing too close and he WILL aggro if he sees you fighting stuff or is too close to a pet... and you'll die
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The entrance to HS is quite an easy spot though, especially for a chanter since you can aggro 5 sets of 2 mobs at a time which are all close to the same level... perfect for charm killing. Just gotta watch out for the east pather. Respawn times (in the whole zone) are ~21 minutes.
The basement is more difficult than the entryway. There's no east pather to worry about, but mobs path all over the place instead of standing still and there are wizard skeletons (oblations I think) in addition to an assortment of live and undead mobs. The tunnels in the basement can be useful because if you die in a wing and you're locked out from doing a CR, you can often /corpse from down in the tunnels to drag yourself out of the wing above. The tunnels are also where you fall into if you hit a pit trap in any of the wings (or the east steps). There's a teleporter pad in the middle of the basement that puts you back up at the zonein point.
North is significantly harder than the basement. Same level mobs as entry/basement, but you get pulls of 1-6 (or even more potentially) mobs at a time unless you're splitting or lulling or something. Wizards, LOTS of harmtouches. But there are nameds in north, including the dude who rarely drops an adamantite club! That's the best loot in the wing, but there are some other 1k or so drops too. There is a key on the ground in one of the named rooms that lets you into the "boss" room for north where The Crypt Keeper drops a key for west. There's a portal in the back of north that takes you to zonein.
West is fairly harder than north. Levels go up a bit, pull difficulty is about the same, same types of NPCs more or less. The nameds are the same as west basically except for the "boss" named who drops the key to south (and rapier of oriin and mask of obtenebration). The keys are like in north; there's one in a named room to get into the boss room and one off the boss. The portal in the boss room takes you to zonein.
South is much harder than west. Stuff is level 49-54 with necromancers instead of wizards. The loot in south is amazing, but it's not a place for the timid. I die in there frequently and I'm getting asked to drag out people for rezzes regularly, even when it was a whole group in there. Keys are a bit different in south; there is one key that is on the ground in a room that lets you open a locked door that leads through some long tunnels over to the room behind the east door. The portal just behind this door takes you out into overthere, at the entrance of the tomb that leads down to HS orb.
East is ridiculously hard. Mobs are even higher level on average than in south, and nameds can be level 55-56. The mobs tend to be a very good mix of undead and living, which makes traveling through the wing very hard solo but not bad with double invis (compared to south where people USUALLY leave undead up but kill living mobs so that you can travel around with just IVU). The door into east from entryway actually isn't locked. There is a locked door that there is no key for behind drusella sathir, and at the way back behind that there is an orb out to OT. Loot in east is not as good overall as south because only the rare drops sell for anything, and DS is a 24 hour timer.
Watch out for pit traps! Carpet on the floor inside the wings usually indicates a fake floor that will drop you down into the basement.