How to give a blowjob

The last time the Complete and Total Loser had an orgasm via oral sex was in 1981. It took ages.
The giver's name was Theresa. She was 22, a year younger than the Loser, pretty, and lived next door. 
Since then, the Loser's abysmal success with women has only led to three women (no men) attempting the same, none successfully. 

This is the Loser's fault. All but two of his orgasms since then have through his own efforts and the amount of stimulation he's used to could only be replicated by the mouth of a hundred-pound catfish.
He remembers the attempts fondly, however, and that's his only advice to women seeking guidance on the matter: Just try. Don't say anything disparaging about your partner's genitals.
Advice to men giving oral sex to women: Just try. Pay attention to your partner. If you do something and she reacts with a change in breath or a moan, remember what you did and come back to it more often than the other things you may be doing.