In many ways working on a t-top car should make it much easier. I replaced mine last summer in a solid roof car and it was a pretty hefty task, didn't help that I pulled my back that same week, so everything I did hurt. I was very thorough and used a sanding disc to remove every bit of old dried adhesive off the board before applying the new stuff.
If you're up for a bit of a challenge then go for it, or avoid the headache and pay someone.