Using Hammer is just another skill to learn, like learning a new programming language, or how to sew a quilt, or how to skin small furry woodland animals. First couple times you do it, you'll get an ugly map/memory-eating code/a badly sewn blanket/a bloody mess. It just takes time and a little practice (and maybe a large supply of dead small furry woodland animals). There are plenty of how-tos and tutorials all over this site, youtube, and other places.
If you get a good idea in your head, that should take care of the laziness. Plus remember that its not a race. Work on it a little while, then put it on the back burner for a few days/weeks. Come back refreshed.
Notice: No small furry woodland animals were harmed in the making of this post. They were already dead when we found them.