Yes, it is not hard. First and obviously, get the part. The motor mount is redesigned for the 2000 so it will look different.
Next, remove the bolt at the top of the mount.
Get a large block of wood and *very* carefully jack up the motor from underneath of the van - when I say jack up the motor - I mean just the motor - place the block of wood between the jack and some part of the engine near the motor mount so that you can lift the engine off the motor mount. Be very careful and don't use the exhaust manifold to jack it.
remove the three bolts holding the motor mount to the frame. the rear one is a bitch but keep working at it using a universal joint on your socket to extension.
put the new one in, make sure to connect the vacuum hose and gently lower the engine back onto the upper mount bolt.
This is from memory :)
Sunil