Hi Rach
The prep methods for Bio have changed somewhat over time, and indeed have changed again reasonably lately. Not that the old methods are wrong, they just introduce new options and take into account the introduction of new products. That could also explain why colleagues prep differently to you. Likewise, the methods are very personal and each tech develops what works best for them....I don't prep exactly the way I was trained but I'm sticking with what I do as it works best for me.
Firstly, let me say, Bio works best with Bio prep products. I am also Creative trained and do believe the actual prep products themselves from Creative to be superior, but they don't work aswell under Bio for some reason, so having tried them, I'm back to Bio with Bio so to speak.
So my prep is
1/ Myself and client wash with anti-bacterial hand cleanser, dry and then do a good spray including under the nails with your Anti-fungal, make sure hands dry.
2/ Remove polish if applied (I usually cleanse with polish remover if new client anyway, even if no polish, just to remove any old polish residue)
3/ Cuticle remover on all nails on one hand, remove cuticle with metal pushie (I use a scoop shaped one) and repeat other hand. Final clean up with Cuti-stone (always with Cuticle remover or conditioner, or even water as it scratches without)
4/ Cleanse nails with sanitiser to remove lifted cuticle and cuticle products.
5/ Shape, inc under FE with Cutistone again....helps remove those little stubborn burrs
6/ Sanitise all nails throughly and let dry.
7/ Apply Vitamin dose - this is a gorgeous product, only started using it recently but am totally sold on it. Let dry for a min or 2. Apply thin patch in centre nail of Exec base, if I'm using. Let dry thoroughly. (Gel on not dry exec base = not good...and often the cause of liftng I believe, but I don't get any lifting ever if its thoroughly dry)
8/ Very gentle buff across the nail surface and/or Exec base to remove any smooth patches. Often don't do this if not using Exec base and no shiny patches as Bio clings to the natural nail very well.
9/ Dust nails to remove any filing, nail dust and buffed exec base and proceed with application.
As I say, this is personal, but works for me...the method in the manual works well too, but takes me longer (time is money) and of course, each time can differ as the does the clients nails!
So I'd say have a play - find what works for you, taking into account your hygiene of course. No way am I holding someones hands for an hour and half without thoroughly cleansing them very first thing and likewise you need to ensure your prep is thorough. But don't panic about methods...like I say, what works for you!