SpreadEagle,
A little harsh, no? How about a little empathy maybe. In my limited experience nerves are something that can be overcome with familiarity and practice; this applies to all aspects of life and not just aviation. Ask any barrister or surgeon and I'll be amazed if they aren't nervous after newly qualifiying, having to make the leap into practising what they have been studying so hard for. The fact the OP is continually makin mistakes is not something I can offer much help with.
I was extremely nervous before I did my Xcountry flight for my PPL, does that mean I shouldn't aspire to a professional position?
Perhaps it was the way I read it, but you seem to be very bitter about the fact that the OP is having his TR paid for by his employer. If you care to step down from your 'super cool and composed high horse' that you appear to be on, maybe you will appreciate the fact that the OP has progressed this far to at least a satisfactory standard, so who are you to judge that he/she isn't cut out for this job? You clearly made no mistakes or had any hiccups on your way to where you are now.
As for your quote and closing sentence....I think your attitude is the one which could do with changing. Whatever happened to helping out your fellow man before berating and judging them on an internet forum?!
I don't claim to have any professional experience, but took offence to your post so am simply offering my opinion.