YES its a big PITA, but you can make up for it by accomplishing several things whilst you are in there... its not going to be cheap or easy you may as well do all 4 doors as you will quickly get the hang of the task
First buy the new gaskets for the wings and the glass seals and Chanel seals,
2nd buy all new flex tracks from TGW or BJ's - not the local auto store, also get a coffee can 3/4 full of diesel - or gas if so inclined......( wait for it !)
if you have a set of 1/4 drive sockets you are good - you will also need a set of cheap torx screwdrivers for the window regulator parts, screwdriver set and allem wrench set as well as a rivit gun and SS rivits
get a spray can of lithium grease and electrical contact cleaner, a small wire brush is also good as well as a small tube of dielectric grease
1. remove the door pannels, - be careful with the window switches...
remove the window regulator assembelyyou have to power up/down the windoe till you can see the torx bolt in the access hole - remove the regulator - mark the screw positions with a sharpie
2. remove ALL the window Chanel guts - mark them with a sharpie
3. remove the door window seals - they sell a tool for this that looks like a pry bar - remove the main window
4. remove the door lock mechanism and toss it in the can of gas/diesel to soak.
remove the wing window bolts and the rivit holding to to the frame ( at the top) remove the wing window......go get the pins re-welded ( be sure they protect the glass)
spend some quality time degreasing the locking assy and white lube it to death....put it back in
put the windows back in whilst replacing all the wipes, channel felts ( good fun)
put the regulator back in with the new flex tracks after having cleaned and lubed everything
douch out the window switches while operating them with the electrical cleaner - i like to give them a final small shot of wd40 at the end...
remove the switches from the backplane ( careful not to split it open or break the retaining clips) clean the %^&% out the the switch pins and their female counterparts use dielectric grease to keep the water out - do this on the window motor contacts as well
reassemble and repeat for the rest of the doors......a nice full weekends work for sure
also check the drain holes and vac out the bottom of the door
Buy a microbrew sixpack and have some good swear words ready....
tell us how it went - or if you said &^*(^( it and bought a Kia LOL