I just see my family doctor. A lot of trans ppl also see him (a lot of trans ppl I've referred to him, LOL). But, he's good. I know a few people around here who have gone to endros and then ended up liking this family doc (after all, just 'cause they are an endo it doesn't mean they know much about HRT for trans folk, unless they have researched it or took a class on it... I've heard of a lot of endo's giving very low doses usually given to post-menopausal woman 'cause they didn't really know what to do).
I have only seen an endo once, who looked at what my GP doc was doing and said it looked fine to him and he didn't see a reason I needed to see him - my doctor was doing everything right.
If your doctor doesn't know what to do, There's a link on the Vancouver Health Trans page
http://transhealth.vch.ca/resources/careguidelines.html for doctor resources (there is also consumer info, there, too) I don't know if I'm allowed to link the specific PDF, since it contains doses -- but, it's easy to find the PDF for docs on the page. It also says what blood tests he or she should do. Print out a copy and give to your doctor. There are doctors out there willing to learn, and often if you give them this info, especially since it's for docs from docs, it can help them out a lot. Sometimes docs get busy and they don't always have the time to go googling for the information, especially 'cause there's a lot of different info out there to go and weed through.
Good luck!