A coupla things:
1. Why wait to get started? You seem to have accepted that certain foods are less than ideal, so why keep on eating them? Id say start today and make the most primal choices at each meal. Ok, so it's the holidays and there's gonna be times where there are lots of yummy treats around that you love, so when that happens and if you really can't resist, go for it and enjoy them (I know I did on Xmas day). But But icing day was a new day and i made good food choices again.
2. There's not a great deal of difference between what Robb and Mark say and even less between what they do. Robb actually eats "primal" rather than strict paleo.
The main difference is how you make the switch to primal/paleo. Robb recommends cutting all grains, dairy and legumes/pulses for at least 30 day to see how it affects you. After which, you can introduce different types of dairy (starting with the fattest such as ghee, butter, cream) and seeing if they cause any problems. If the do, ditch them, if they don't, eat away
Whereas mark is a bit more relaxed about the transition and says you can do the cold turkey thing, or do it in stages and work on making each meal more primal, cutting out grain first, then sugar, etc. mainly i think because so many people lack the will power to go cold turkey so this makes it more do'able for many.