Oh we just jumped this hoop last week........What I did was brought him out in the arena and had about 3-4 cookies in my pocket. I started by just spraying it out...not at him directly, the praised him and let him sniff the bottle. Then I rubbed it around his neck and back, let him smell it when he would get antsy. After that, I would back off and let him be. I would repeat this for about 15 minutes until I was able to actually spray his body a little. When he let me spray his body, I gave him a cookie and praised him. Then I would walk off. I repeated this several times at different parts of his body until he didnt care anymore. All the while when he got a little nervous, I let him sniff it, lick it, ect, then I would rub it against his body. I came back after that week and just sprayed him with it (cookie in my pocket in case), and he barely flinched!!!! I was so excited!
All of the posts are really good advice! This is how it worked for me