You can jump the seat swith motors by touching the contacts at the motors on the power and ground if the switch is bad.

You can use a 12 volt cordless drill batter with wires attached to power and ground of the battery and jump them to the power and ground on the seat motors.

Just play with them till you get it moving the right way, then you can access your seat hold down bolts.

Sometimes I have had motors jam up, and the solution was to push alot of my body weight in the direction that I was intending to move the seat.

I do have a question though, Have you checked all the fuses?
Check for wear marks on the fuses, you may need to replace them if contacts are worn.