i just push em out with my feet, not bust one yet. start in the corner and apply gentle but firm pressure. eventually it should pop out, once you have a bit of the glass out the rest will follow. same goes for 3 door rear quarters, cant do this with screen tho as it will crack. for them safest way is to cut the seal, if replacing you really want to use a new seal as re-using old one could lead to a leak, and screen swap isnt a job you want to do twice really
refitting is easier with string but ive done it without when i didn't have any. fit seal to glass, then drop it into the metal lip at the bottom. then work your way round using a plastic lever to pull the inside lip over the metal. it will take a while and kill your fingers but will get there eventually.
