You can go to www.etchmaster.com. Norm and Ruth Dobbins offer a wide range of video tapes on the subject. They also offer some excellent (and super fun) seminars.

On-site blasting requires special equipment so that you will minimize the mess. Obviously you will need a portable air compressor. You will also need a specialized unit that will blast the material then collect the grit immediately. Here is the unit I am referring to. http://www.glastar.com/catalog/sandblasting/OS-7.cfm