way i had mine checked was simple...
get a helper to start your car (you should be starting your car with the clutch depressed btw)
then...just start the engine... there shouldnt be MUCH movement although there ought to be some movement in the engine, then rev the engine, again, shouldnt be much movement in the engine when you rev it - a little is expected. (would be a good idea to do this when the engine is warm btw)
for the lower engine mount, dont do what i did and stick a bar in there and tear the mount! lol. if your worried about the bottom mount, just stick a powerflex insert in there, i know that eurocarparts do them for about 21/22quid if you want it quicker than ordering off the net
good luck!