There is a guide by mpcstuff.com on youtube on how to upgrade the pads, if you follow the first few basic steps it shows you how to take the lid off and from there its just basically unscrewing the circuit board from the 1k frame finding the solder points, desoldering them (buy desoldering braid highly highly recommended) remove button and place new button and solder.
when soldering dont just blast the board with heat you can fk it up
i myself soldered a new jog wheel on a 2kxl with basically zippo on soldering experience.
if you attempt to do this yourself #1 item that is a must have (besides a soldering iron

is desoldering braid) the braid sucks up solder like nonones business.
i wish i could help more but i dont have a 1k anymore.