Congrats, give yourself a pat on the back.
I would wear proper footware in the garage. Not only is it easy enough to drop something on your feet while working in a garage, when your spraying products, especially with isocyanates, you want all exposed skin covered. Besides isos being able to enter by breathing them in, The skin will absorb them, and they are attracted towards moisture (cover your eyes too) .
I like leveling most of the run by scraping with a razor blade. The method has been mentioned in past threads. And finish up leveling with a hard block. But you will want to allow those runs a chance to cure up a bit, or else you could tear off the clear at the heads of the runs if its still too soft.