Holy ****. This is a sure way to ruin two $1000 devices.

Without very, very expensive soldering stations, with a very careful operator doing the replacement, you'll almost certainly wreck it.

The RAM is literally on top of the CPU, the pins of which are incredibly tiny. You will not get the solder balls on them without the right mask.

Also, cleaning the CPU's POP contacts would be an almighty b***h.