cam

so I've got a 2003 spec B legacy and the auto transmissions called it quits at 130,000kms due to my unfortunate financial position at the moment I have no real option other than to replace it myself... to be honest I know sweet f**k all about what I'm going to be doing, so would be gold if maybe I could get some feed back about... good places to look for a replacement, how to actually take the friggn thing out, and what tools I'll need. I am a sparky so am practically competent but was just wondering if you lot have any tips and tricks. thanks