Instead of just painting the parts I need for an assembly, like the flight deck of an aircraft, I will research the aircraft, ship, spacecraft, whatever and first find a unique paint scheme, then I will prepaint the whole model, while all the parts are on the tree.
This is easier and you avoid getting paint on clear parts this way. I also use acrylic paints, so I have better control and clean up.
Here are some examples of me working a few of my models, and showing the process.
P.S. One thing I also do, is look for out of the ordinary kits, the above is an example of this, this is a model of the SM-79 bomber, used by Italy in World War 2 The plane is not one of the better known types, like the P-47 or Me-109, and the paint scheme I found at a facebook page that does profiles of WW 2 aircraft and armor, and this paint scheme was shown at the page.
Look for something out of the ordinary, it makes model building, that much more fun.