I have a similar model (TVR2)- I hope my comments help. It is not hard, but very messy (ie a bad design)! You have to take the front and side panels off, so that you can slip the new belt over the drum and then over the drive shaft of the motor. Easy, but lots of screws and lots of patience putting it all back together. The belt will have left a mark on the drum, so its fairly easy to see where to place it. Good luck!
Richard
June 2007