As Vidar said, Grobb itself is safe (just don't go very far in), but you'll want invis to get past the two guards out in the swamp. When I was killing guards there I found that I could get past the swamp ones without agro if I ran exactly in-between them, but I was 40+ at the time; at lower levels I'd imagine the agro radius is too wide.
Also if you don't have invis but do have SoW or JBoots, you could just try running past them and then training them in to Guk ... but it would depend on your ability to take a few hits from them.
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