I've never joined a guild on any of my level 50+ characters so I've only gotten as far as thurgadin armour pieces. The only way I obtained the armour from arena used in the quest was to ask guilds if I could come along or wait for open arena raids.
For dragon or giant armour you're going to need to become close with a bigger guild or join one.
The gems for thurg armour are pretty easy to get, people even sell them relatively cheap which is how I encourage people to obtain them just to save a lot of farming time.
The dragon/giant armour gems can be gotten in a high level pub group.
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For faction if you can't find a big faction group happening. Find someone who is killing mobs which grant faction you want. Explain to them that you just need to tap the mob to gain faction and that it wont have any affect on them. Low level DD, pet, etc.
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