Othoap,
As a woodworker who drew by hand for more than 20 years, I can testify that what Chris Fuller say's is abosolutely dead on.
"Stop thinking about shapes as primitives that must be manipulated through dialog windows and think about shapes as objects made up of lines, as if you were drawing them with a pencil. Its a bit of a mindset shift coming into SU from most other modelers."
Sketchup was the first program I tried that drew the way is most natural to me. Is it perfect? No. But it's a super program that after using for 18 months I'm still learning new things every day. And I could not have done it without the help of the good folks on this forum. Always get quick and in my case patient walking through of whatever problem I've had. If you're using it professionally, become proficient at the basics before you run into a deadline, or you'll surly become dishearted at the program. The # of tutorials out there coupled with plugins make Sketchup a winner in my book.