I replaced my mbp battery recently, it wasn't too bad. Apple also quoted me needing to replace logic board, etc. due to some water damage indicators tripped. Just go slow and it's only ~<$200 for battery.
Not to hold you back from getting a new framework, I replaced my battery but am still looking at one of these too!
Not to hold you back from getting a new framework, I replaced my battery but am still looking at one of these too!