I'm upgrading to a larger hard drive. You're saying I don't need to run the recovery disk assistant at all? I can just plug in my Time Machine backup and recover from there? I have an older model macbook. It's the aluminum 13" model, late 2008. From all the research I've been doing and after talkin to a couple of techs at two different Apple stores, my macbook doesn't have the firmwire to use OS X recovery so I have to use the recovery disk assistant. Is this true?
It's very simple to test. Turn off your computer. Have your time machine backup plugged in. Hold option and turn it on, keeping option held. Do you see your time machine drive? If so, select it and press enter. You'll end up in recovery. If it works, there you go. Then just click the apple and restart to get back to your regular desktop. Then you'll know for when you're ready to do the deed.
I'm not sure if time machine will think it's an entirely different computer, though, when a hard drive changed, making an actual restore not doable. Either way, you could still reinstall mt lion fresh and then just migrate after, skipping the need for SL.