Question about replacing Neo 2.2 with Messiah Pro 2 Chip

[FantomLord]

I have an older version PS2 (version 4) with a Neo 2.2 MOD chip installed. I have been using the swap method with the game shark cd for years and now decided to buy the Messiah Pro 2 MOD Chip so that I don't have to hassle with the swapping. I'm use to soldering the Neo and others PS1 chips with no problem but the instructions for the PS2 MOD chip at Messiah's website ask for using flux, solder paste, de-soldering braid, safety razor blade, blue tack and glue. My question is two fold. Has anyone installed this type of chip? If so, how difficult was it and do I need all of these things? And two, can I install the Messiah 2 chip after the Neo 2.2 has been installed? I heard rumors that the laser gets affected and I may need to purchase a need laser or may have to calibrate it or even install it in a new console.

thx
FäntomLord