Hi There Arrow - I did write a little on the Miata.net - if you go there - please do a search.
Its actually simple - I can give you a few pointers.
If you have a FSTB remove it first or your Engine will not rise high enough.
Put the car on jack stand (not the jack- safety first)
Put a jack under the oil pan - don't worry - or similar point.
remove the wheels.
There are plastic covers which will be in the way - easy to remove - one turn with the philips head screw and they pop out - you'll see them when you look towards the mount from the wheel well.
Then raise the engine - loosen the bolts and the mount will just drop off.
I have a good jack with a 5" round rubber pad - you can use a wood block or something.
You can do both at the same time or one at a time.
easy stuff- should take less then two hours.
Go for it -
- you'll be fine.