Pants off or just unzip the zipper if it's a quicky. Any position is good as long as both of you are comfortable. Sitting on the edge of a bed or couch works best if the girl can have something soft to kneel on. This is great because then a girl can guide him to laying if she finds that's working better for her towards the end as she finishes him. The best advice I can give is to be enthused with what you're doing and plan to get him off and make him cum. Knowing what you intend to do ahead of time will help you be more aggressive and less shy, and this will be more enjoyable for both of you. Don't be shy as you use your lips, mouth and tongue or else it may take you too long.
Even though at the moment its happening its torture I love for a girl to be really slow and teasing. Just sort of touch my pants put your hand on my erection. Slowly unbuckle and unzip reach into my boxers. Its really up to you, do what you like. Its kinda hot to be standing up and a girl gets down on her knees. My advice take your time. Getting a blowjob is as much a mental and visual pleasure for a guy as it is a physical one
Unzip his pants and have him lay at the edge of the bed so you can kneel or stand while giving him head. This will enable you to have two free hands to use on him.
I'd say pull down his pants and have him laying down, near the edge or foot of a bed, that way you have easier access, especially if you've never done it before.
unzip his pants with your mouth either sitting or laying down which ever is more comfy
Scroll Down to Read Other Opinions
What's Your Opinion? Sign Up Now!what ever feels right at the moment. depends on the surrounding
i would say pull his pants off
cause there's more room
and only pull it out thru the zipper if you wanna do something sneaky ;)
Sexual Relationships 
Sexual Health 
Most Helpful Guys