How to replace the laser in a CD player 

I need to replace the whole laser assembly because I have the little main motor gear falling apart. I found the assembly on Amazon but it said it needed to be desoldered. What all does that entail?

I don't have the equipment so i set as far in either direction that it stopped reading the disc then put it half way between those settings.

@@grahammoore2157 thank you, i'll do the same as well. Also because the trimmer is centered even in the original module, thus I'll basically replicate the setting.