How difficult is it to change oil pan gasket in 03 f150 4.6L?

Depends on if it is 2wd or 4x4. The engine must be raised either way, but may not need pulled all of the way if a 2wd.

well it isnt that hard if there is a cross member take it off. then there are a few bolts like anywhere from 6 to 12 holding the pan up, take them out. you may need to pry it off because of the rvt sealer if its never been done before alot of dealerships use that instead of a real gasket unless its a cork one. put some sealer on the rim of your pan and a new gasket put it up and start bolting and make sure you get the tourque specs and do a cross pattern with it and then put ur cross member up if there is one. and your finished put oil in, run it for a minute or two and check for leaks.

Ask the dealer for hours. It used to be an 8 hour job and the engine had to come out to change it.

Good Luck!