Like Mildred says, your biggest problem will be getting the old ones out. I managed it with some sawn-off tubing of the right diameter,long bolts and combinations of washers but its a bit of a pain. You may also want to replace some of the bolts at the same time, a couple of mine stripped as they came out.
The polybushes are so much easier to install, they often come with a small sachet of silicone grease to lubricate and assist installtion.
If you are doing the front subframe as well you need to see Odds excellent photos - its a sticky subject on General Wedgie ChitChat.
Russ
1980 TR7 Sprint DHC
Dursley
UK
http://tr7russ.blogspot.co.uk/