I think if you have to ask, parting-out is not for you. It's not a money making venture (because of time and space involved) and you will always be building "dead" inventory. Good advice proceeded this. It's for those who "really, really, really" enjoy it. Financially speaking, you will come out further ahead with a second job or just putting time into advancing your career. Unless Amazon continues to remove listings, you will never be stuck moving whole sets (although who knows what will happen next).
Take any thoughts of making money out of the equation and ask yourself if you would rather play video games, play pickleball, play with your kids/friends, spend time with your wife/girlfriend, or ACTUALLY BUILD LEGO SETS!! If you would rather part out sets and organize then, well, go for it!