What I did was, start with 50 taming. Had my other character gate me to polar bears. I just tamed everything on ice until around 60 something, can't remember. Then I did white wolves all the way to 71.1. that's when I switched to bulls.
Now, Taming bulls to gm takes forever... it's just stupid... Ridgebacks...then swampies... You can set up a macro with razor and be done in no time. I'd guess It took me about 12 hours to gm taming 1st skill... This 48 hours thing is crazy.
It's so easy to make a tamer with this book.. I made a tamer theif for fun... Had taming GMed before I could even join the thieves guild.