Slayer, I know you are a bit discouraged, so to give your ego a boost I would recommend the following:

Go to the guy who sold you or recommended this mustang and... SLAP THE LIVING #$@#$# OUT OF HIM!

Sorry about that, but often times someone selling an airplane will say anything to you to make a sale.

If however you made the choice on your own, heed the above advice. It is sound and wise advice. Be patient, You'll be flying that twin in no time. Good luck.