Just in case you ever want to drill a few holes in concrete for some tapcons...
Don't even consider trying to do so with a regular drill. Just don't.
Just run off to Rona (or whatever your local BORG is called) and get yourself a basic Hammer Drill. (this one works.)
You really DO need to have the right tool for the job.
All of a sudden a frustratingly impossible task will suddenly .... just work.
FYI, FWIW, TTFN.