the bikram series taught most often is the "begginer" series, it is the same 26 postures, and the same dialogue over and over again, but since your body is different every time, the classes are very different.
just a suggestion though- you're going to hate class 1, youre going to hate it, and you're going to HATE class 2, and by class 3, your body is going to get used to it. i really really want to suggest you do your first 3 classes within the first week, and then keep it at a minimum of twice a week.
i say this because a solid week + break lets your body get "un-used" to the heat, and you will continue feeling like poop once you go into the room. but if you practice atleast twice a week, you will acclimatize.
i have been practicing for almost a year, and ive come to the point where i find the room cold under 44 degrees. patience and perseverence!
also, you don't plateau with bikram, from experience, you DON'T plateau.
"do not give yourself the permission to self-medicate with food" - eat to live.
164 (Normal BMI).
"every day that you don't gain a lb back in a victory on it's own."