I drove a part of the distance and rode the rest, every day. Each week I stretched the riding distance until one day I took the plunge and did the whole distance. I was pretty stuffed after that, so the next few days I drove part of the distance again. I quickly got used to the whole distance and now I do it every day.

Once you do it every day, drive yourself hard Mon & Tue, take it easy Wed ride slowly, go at it hard again Thu & Fri. The Wed recovery day is important.

I'm addicted, but I also detest driving in traffic so I have a double incentive.