Yes and no
Soldering 400 pins 100 per chip can be a slow job and even when you think there all good the chip can still fail a test due to 1 pin not soldered or a less than hair thickness short.
If your going to have a go get some old computers to practice on 1st and in Homer Simpson's words work the internet on the google machine and watch heaps of clips on soldering.
My 1st 80 pin micro I changed took over an hour to do 1 chip now 90 minutes for the 4 chips and that's taking my time and testing each chip with Xblast.
Cheers
SS Dave
Soft modding is like masturbating, It get's the job done but it's nothing like the real thing.