Drivetrain Automatic Transmission Seal Leak.

Hey guys,

I have a small drip coming from the end of the automatic trans that links with the Drive shaft yoke.
I'm about to put in the aluminum driveshaft in about another week or 2 and would like to have this resolved. My questions are.

Is the trans seal an easy enough fix?
Can it be done with the trans still in the car?
Can anyone guide me or point me to instructions for the procedure?

As always help is most appreciated.

Thanks in advance.

I didnt think it was too bad of a job and I was right.
I found this link detailing the job with photos.
It isnt being done on a Mustang but its pretty much the same deal for every auto trans.

http://www.automedia.com/Auto-Trans_Rear_Seal_Replacement/ccr20021001ts/1