I installed 2GB x2 to mine to upgrade from 1GB x2. It took just minutes and I used a regular philips screw driver I found around home. Pull hard on the black straps to get the memory out. It is working great with no problems. Good luck!

I bought and installed 4GB x2 RAM for my Mid 2009 15 inch MacBook Pro and it was easy and is working great. Before this I had 4GB and it was being maxed out. It was very easy. I did purchase the required tools which made it simple. I also swapped the battery at the same time. I am writing this from the same computer and it is working well. Good luck!

I bought and installed the ifixit.com battery for my Mid 2009 15 inch MacBook Pro and it was easy and is working great. Much better than the dying battery it had. It was very easy. I did purchase the required tools which made it simple. Thanks.