You have quite a few options. I will agree though, that I've never heard of a license being required to use a hilti or ramset gun. At least for a homeowner. One option is tapcons, they are baically screws designed for concrete. Very strong and require only a 3/16" hole. If you don't have too many to do a heavy duty 3/8" drill should handle it without much trouble. Tapcons will probably cost around 25-30 cents apiece. Another option is hardened nails, if your concrete is old I would predrill to use these. Much cheaper to use though. A very inexpensive option is to drill a 3/16" hole like for tapcons but instead drive two 16 penny nails side by side into the hole. Drive them at the same and they will wedge tight and have surprising holding power. You're really only concerned about lateral movement anyway and they will keep the plate in place until your walls are up. Another option would construction adhesive. You would have to wedge the plate in place until the adhesive sets up but it's very effective and won't hurt your ears. Steve K.