There is no such thing as too dumb, it's just a matter of time.
Here's a quick little tutorial:
In the Top viewport, load a guitar design (Optional)
Type "InterpCrv"
Trace the guitar design, paying attention to corners and horns. You'll probably need more points in the corners to get it right. If you're freestyling (no design in the backround), you may want to allow yourself more points then necessary.
I can't think of the next command, but with your curve highlighted, turn control points on. (I think the command might be "ControlPointsOn". You'll get a display of all your point, and now you can tweak your curve to your specifications. This is why I said freestylers should leave more points in, so you have more to tweak. You can also delete points here that are causing problems.
When you are done, hit the escape key to turn off the control points.
With your curve selected again, type "ExtrudeCrv". Before you extrude it, check to see if in the command bar it says "Cap=Yes". If it says "Cap=No", type "C" and press enter to turn capping on.
This is a bit of an idiosyncratic step, but I think it works pretty well for guitar design. When it asks for extrusion length, type "1.75" (For a 1 3/4" thick body. If you're doing something thicker/thinner, your value will change.") Don't worry if your guitar appears chunky at this point, because it's actually at the proper height, and the length and width are wrong.
Select your body and type "Scale2D". This will uniformly scale your length and width without changing your height. You may want to use the Perspective viewport for reference so you can get a good idea of how the guitar looks when you scale.
Voila! A simple guitar body. To do any pocketing, you're going to use the command "BooleanDifference". If you want to round the edges, use "FilletEdge". Play around with it!