It is not complicated. My leftover SSD went to my PS3 years ago. If the SSD is larger than the PS3 HDD, then you can use minitool's partition wizard home which is free to sector-by-sector clone the PS3 HDD to SSD. When you plug that SSD into the PS3 it will be the same size of the PS3 HDD. That is the EASIEST and QUICKEST way. It's good if you just want to see if it helps you any.
The correct way is to backup the PS3 using it's backup utility. This can take a long time since the PS3 seems limited to 8MB/s USB transfer. To do this you'll
1) synch your trophies
2) plug in a USB drive with enough space to copy the PS3 HDD contents
3) copy the latest PS3 firmware from the Sony website onto that USB drive
4) plug the SSD in, on startup it will want to install the PS3 firmware
5) once it's fully working, perform the restore
6) re-synch your trophies, activate your PS3 for downloadable games/video.
Done!
It's benefits depend on the game. I found it indispensable for both Fallout 3 and Fallout 3: New Vegas. Entering new areas didn't take up to 30 seconds. Which I honestly didn't mind sometimes since it forced my body to stand up and reset my eyes from hours of gaming.
