tl;dw:
Reuired time 1-2 hours (with a friend's help)
1) Tape edges, trim, lights, and windows (Remove tailgate if necessary)
2) roughen paint of entire bed with 120-140 grit sandpaper (gives liner something to stick to)
3) Wipe off sanding dust with soap and water. Let dry
4) apply bedliner in nice easy strokes, careful not to apply too much in a single coat to cause dripping/globbing
5) Allow to dry
6) recoat if thicker layer required
7) remove tape