Orgasm Tips? 😕

I am in a long distance relationship with the love of my life! I wouldn't trade him for anything.. except on the days where I am specifically sexually needy. On those days, I trade him for a Miracle vibrator and try my best.
My problem is that I am very unsexually advanced and never really sure if I'm doing it right. With him, I'm a squirter and it's very obvious when I finish. By myself, I never know if I'm doing enough! It could feel great and I'm shaking and warm and helpless like a lot of people say they get when they're at the finish line, but I never feel that release like I do with sex. 
How do I know when I'm done?
Are there any tips you have for me?