In reply to cb294:
Your advice still holds. Actually, a real risk for arts and humanities PhDs is choosing or sliding into isolation.
spidermonkey09:
Selecting a suitable PGR community (the historians lab) is important for well-being, research and even future career development (if you stay in academia these people will be future colleagues and/or collaborators; if you leave, they may still be future colleagues and/or collaborators).
There will be opportunities to be a GTA., depending on the university/faculty/department/whatever there will be opportunities to join smaller communities of PGRs who organise and deliver training , conferences and seminars for other PGRs; actually, I'll stop there. I could be listing stuff all day. They'll also support you through the 'second year blues' (can also occure at 18 months) in a way that other people who haven't had or are having that experience can.
Work-life balance is very important, quality of life is very important, having non-research/academic friends/activties is very important - yet, you don't want to be dreading/avoiding going in or avoiding working on your research because of unpleasant associations with the research community and environment.
If you are a resilient, independent, prefer-being-on-your-own type, choosing not to go in your department could have repercussions, if not for your well-being and, in an obvious way (but I would argue it would have a subtle and insidious impact) , on your research, but almost definitely on paving the way for life after your PhD.
The University of Warwick publishes a blog for PhDs written by PhDs with some wise and thoughtful posts. Here are a couple that might be useful to you:
https://phdlife.warwick.ac.uk/2016/08/17/being-a-phd-and-all-the-rest/
https://phdlife.warwick.ac.uk/2016/08/31/peer-support/