Do they measure your head to see what size you are or do you just try on every size and do they have arai XD-4 helmet and how I will be new to riding motorcycles will they give best advice or just try to sell me things I dont need

Number 1 advice when buying a helmet. As soon as u get there pick your helmet and size u think fits best. Then do the rest of ur shopping with it on. If ur not buying anything else then do some wishful browsing for atleast 15min. After 15min and u don't feel pressure on the sides of ur head or forehead and your cheeks are are squished like chubby then thats the size and helmet for u. I emphasize "and thats the helmet for u" Ive had arai large and shoei in the same size. Aral is much rounder leaving a red cherry in the middle of my forehead. It hurts.

My experience with sales staff has been excellent. They provide information about the different products without pushing you to purchase a specific brand, or quality of product. There are lots of choices and one size does not fit all. They listen to what you desire and provide information to help you meet your goal.