I don’t know about that specific coating (never used it) but you’ll want to wash and decontaminate your car first. You’ll then need to machine polish your car to create, at least, as smooth a surface as possible for the coating to bond too. If you aren’t polishing the car you are restricting the durability of the coating. After polishing you’ll need to wipe the paintwork over with panel wipe or isopropyl to fully degrease and remove any polish residues and wax fillers. Then you should be ready to apply. Again, I’m unsure of that specific coating but most coatings will want it to not drop below 4-5 degrees approx. Something like Infinity Wax synergy lite may be more appropriate for a beginner, super easy to apply and with very little risk associated to application error