Joy has a 2012 13" Macbook Pro. Is it worth it to replace the hard drive with an SSD and boost the RAM? Leo says it's worth it ... if you want to do it. It'll require a special tool, but you can get that at OWC. And OWC will have videos showing you how to do it. And the boost in performance will be huge with an SSD drive. It'll cost about $200 to do it. But if you like to tinker, it's a great little project that's easy to do.
Another place to research how is at iFixit.