I know a few people who had top surgery done first. For a few of them, it was because they were unsure about T but knew they wanted top surgery. For others, that was just the order that the options became available to them. Of the people I know, all of them did go on T except one.
I can't think of any surgeons in Maine off the top of my head, but that doesn't mean there aren't any. Best advice would be to look at your insurance and see what they require before they'll pay for surgery. Some will want you to satisfy certain requirements (think WPATH guidelines). They'd also be able to tell you if there's anyone in network that you could go to.