I was also trepidatious, Gill, but I purchased a Crucial 120Gb SSD drive, which came with instructions on how to migrate an existing system to the new drive, using the Acronis clone tool. As I already have Acronis on board for backups, I didn't need to install Crucial's version, so used the Clone tool as instructed to clone my existing C drive to the new SSD. The clone job took about 18 minutes, which worried me, as I thought it was going to take much longer for an 80Gb drive, but I thought I'd go with it and see what happened, as all I needed to do then was physically swap the current hard drive for the new SSD. Had it all gone to pot, I would have still had the original drive which I could have popped back in, plus I had a backup on a separate backup drive, so I had nothing to lose, really, as all of my data was on other drives, and the C drive only had Windows and programs on it.
Once I'd completed the migration, I fired up the PC, and was pleasantly shocked that it all worked fine, with the OS and programs all intact.