brynndragon | Fiddle question

I failed to keep up with habit-formation of playing the fiddle partially because one of the strings on the fiddle I'm using broke (the low G; snapping was preceded by failing to hold tune, which should have been a clue but it's been a while since I've played a real instrument). Today I bought a new set (ball end), figuring it was likely time to replace all of them. The only other instrument I've replaced the strings on is a guitar and that was at least a decade ago. I was intending on replacing them one string at a time, hoping that would keep me from needing to figure out how to place the bridge; I've also found this page and I think there's some tips in that Big Book of Fiddling I got for Christmas. There are fine tuners on all the strings. Is this something I can do on my own? If so, any beginner's tips? If not, any suggestions on who to get to do it/how to find such a person?

(The other part was failure to create effective triggers; I've some ideas on that front involving associating fiddle playing with walking in the door - if I can parse fiddling as relaxing from school/clinic it'll be so much easier ;)