pprune at it's finest I'd say.
Within 2 hours you probably got some of the best advice you could ask for - scroggs that is. My comments were just anecdotal but of some use I hope.
My feeling is that the majority of people who can drive well could probably get a PPL but I know not everyone could get a CPL and/or IR, so if you can get accurately assessed before you launch into this as a career then get that assessment. For many the absolute best and most impartial assessment out there now is the GAPAN test (
www.gapan.org/careers/aptitude.htm). That should leave little doubt in your mind. Plus don't forget the Class 1 medical of course before you start spending oodles of cash on training.
And as scroggs says, a good CPL instructor will always tell you if they have any doubt. If you have too many dark days during the CPL phase and you have doubts then ask the instructor.
Good luck!