Using PRINT for troubleshooting can be a real PITA and the output sometimes doesn't show up until the end of the run instead of as the procedure run unfolds.

I recommend that you learn how to use RAISERROR with a "severity" of "0" and the WITH NOWAIT option. Then, add an optional parameter to the proc called @MessageLevel and use IF in the proc to decide whether to execute the RAISERROR based on the value of @MessageLevel.