personally have done it myself but i had 200 amp service.. gave me more room to move around my wiring...125 service i feel for you
what you running thats popping breaker???
you should have about 15 amps per room(breaker)...which should at 120 volts give you 1800 watts....(tally everything in room thats plugged in)
either you have bad wiring/ground or major draw that should have its own breaker...
my room is running under 1600 watts w /2 tanks and 1 computer and 3 video security cameras..