What method of desoldering are you using copper wick or suction? So far it looks fine your on the backside the connections are on the front and your only removing the anchors you have three to go . Clean the area with electronic flux (resin)which is different than the flux used by plumbers(to corrosive for circuitry) then solder in your new switch. Make sure you use electric solder specific to circuit work not plumber solder. Common mistake amoungst first timers. Keep going you only succeed by trying. Hope this helps