No real prep other than the huge Master-Cleanse in November and relatively better eating after the MC. But it was the holidays and I did treat myself to plenty of no-no's - sweets, starches, meat etc. So, all-in-all, I was not super prepared as in 'eating only veggies and fruits'. It was very hard the fist couple days...up through day 4. Similar to the Master-Cleanse though so there were no real surprises. My energy was a little down compared to the MC, but not unmanageable. I tired in the afternoons but still went about my schedule. I never felt like I was going to black out but I don't know how long that would have continued. I really wanted to find out, but it just didn't work out that way. The fact that you have someone to help you will be of immense benefit and he may be able to gauge how much you can do...and whether or not you should drive.