And just one more thing, SSDs perform better when AHCI is enabled. Although it's likely that your system (if it's fairly modern) has AHCI enabled, it would be wise to check. Some BIOS's have the option to enable AHCI mode on the SATA ports. If it's found that it isn't enabled, it should be. However, a word of caution. If you`ve cloned your OS onto an SSD (or even carried out a fresh install), and you then enable AHCI mode, it's very likely that you won't be able to boot into Windows, as the AHCI drivers will not be present. There is a Micrososft "Fix it" to solve this issue.
http://support.microsoft.com/kb/922976
Once "fixed", you can then check that you have the latest AHCI drivers installed (rather than the default Microsoft ones). For many Intel based motherboards, this can be achieved by downloading and installing Rapid Storage Technology from the Intel website.
So apart from all that, it's easy to upgrade from HDD to SSD.