New to TT (long time pop-upper) WD hitch probs

The others have explained how to do it...block under the tongue jack.crank it up some...then remove. Installing...reverse. Level ground no problem, with truck and trailer level. When I hook up in my drive one side of my truck is a little higher than the right...I have to really jack it up with the tongue jack. Most of the time the dealer sets the hitch up...trailer isn't loaded..truck isn't loaded...etc. It takes a while to get used to how to do it...even getting it set where you what it.