If you can handle a screwdriver, you can do this. My friendly Apple Genius pointed me to the website Other World Computing for my memory upgrade. The site is simple to navigate and helps you find your model number, amount of memory you can upgrade to (I went from 4GB to 16 GB) and provides instructional videos for installation.
If you follow this video, you can see how I upgraded my RAM space. My only glitch was not having a small enough (++) Phillips head screwdriver when I was ready to upgrade. You can order that from the company as well but I didn't and realized I needed it after the fact. I found a set at Lowe's that had the size I needed for less than $10.
The video link also has step by step instructions and photos which were so helpful The difficulty level was EASY so it was the perfect first techy project for me. You basically open up the back of the laptop, remove the old memory modules and insert the new memory modules then close it back up. Easy peasy!
Since the upgrade, my laptop doesn't crash when I have multiple tabs open. I can listen to my favorite Sirius radio station and work on Photoshop at the same time! It also feels faster in general.
We upgraded College Girl's Mac when she was last home too. Just call me Mrs. Tech!
Let's keep in touch!