I agree with above, make sure your process is very tight and parking is pretty easy. You can buy a kit from Brownells or go with a home brew. Home brews are more finicky to process and measurements so might go with the kit for ease of use.
It's a fun project. If you screw it up, no harm. Its just park. It can be redone or sent off. The fun is in the doing.
Ohh, to remove the blue, go with a short dip in 50/50 muriatic acid/water. Just long enough to remove the blue.
As for the park, again, up to you on which to go with. I have some links for home brew if you want.