Just be sure to let the existing paint *FULLY* cure for a few days and test, test, test.
The last thing you want is to spend all that time on a killer paint job and have it react badly to the clear coat.
You won't be happy if your metallics get dull, silver becomes gray, or you get the dreaded 'wrinkle skin'.
Some people use plastic spoons to test on... I found these herb garden stakes at the dollar store to test on then label the back. (and put with the part to remind me where I left off)
But whatever technique you like, don't take shortcuts in the final steps: test and test again