Recently I read that you use a bolt that is one inch longer than the stock bolts. This one longer bolt is easier to thread a nut on and pulls the parts together when the new rubber is thick. You tighten the nut then put and tighten the stock two bolts and nuts. Now remove the long bolt and replace with the stock bolt and nut. Don't forget the cotter pins.
I have done it. It does test your patience -- a lot!
Removing and installing the mounting bolts use a 1/4" rachet and adapter on the socket to turn it in and out much easier.
I would recommend removing the passenger side motor mount completely first, because there is more room to work. Then remove and replace the driver's side motor mount. when that is done, finish replacing the passenger side motor mount. You will have to jack up the motor to take the weight off of the motor mounts.