On a lift is the easiest way because you will need to raise and support the engine while the motor mount is replaced. Once you have a new mount, I would replace both while you are at it, the procedure will become self evident. Not a difficult job.
Actually this can be done at home in your driveway in a couple hours max. Raise the vehicle on jack stands and be sure to set the parking break and block the rear tires. Then use a block of wood and a floor jack under the pulley to raise the motor just enough to take the weight off the mounts. Both the front and rear mounts are attached to the same cross member and you will need to do 50% of the job of taking out the front mount to get the rear mount out and visa versa so it is worth it to replace both if you are going to do one. Remember not to tighten them down more than snug until after the weight of the motor is back on the mounts. There are torque specifications in the front of your repair manual. Of course if you have a lift great, but for most of us do not think that you cannot do this simply because you don't have a lift.
Technically two. Front and rear. There are two more mounts attached to the transaxle.
Cut it out and weld a new one in.
Simply raise the car and support the engine on a jack, then unbolt it.
The motor mounts should not keep breaking if they are installed properly. The delay in the transmission indicates it needs work, probably a rebuild.
The distributor in a Mercury Villager is the round thing at the front of the engine with the six spark plug wires attached to it.
You will have to take out all of the parts to do this. Unless you have some experience with doing automechanics, it is a good idea to take it in.
Front wheel drive
In front of the engine, down in the "V".
Bottom front of engine.
It is on the front of the engine on the end of the crankshaft.
At the front of the motor attached to the engine cradle.
The front wiper arms on a 1997 Mercury Villager clip off once they are bent backwards. To install the new wipers simply slide them into the clip.