Hi Sweetie.
Nail Class is an excellent resource for any nail tech. It's worth having regardless. Your profile doesn't say who you trained with. What system for L & P do you use? The reason I'm asking is because Nail Class isn't a tutor book per se. In my opinion it's written to compliment training and "tweak" skills and techniques. Things like ratio should really come from the educators of they system you use, a book alone cannot give you this information as every system is different and has its own characteristics. Combatting lifting is down to thorough and proper PREP, your chosen systems correct ratio, making sure you're not touching the skin, practice and just experience. If you're new to nails, you will stop having lifting as your skills improve. Hope that helps. Sorry if its not what you want to hear. I would recommend getting the book anyway though xx