What you can do is what I did, go through each of the low level dungeons individually. The game ranks up in difficulty with dungeons anyway, so just go from Sastasha all the way up. Do them multiple times, and look up Youtube vids for each one before you go in there. A lot of the earlier ones are very easy (coming from someone who suffers from tank anxiety who loves her DK but hates tanking for people) and straightforward. I'd say also do the guildhests too, they help a lot with getting used to mass pulling.