I would say a definite "maybe" lol
Before answering I would have to know if you are young, and are able to "recharge" quickly, or if you are more of a "one and done" kind of guy?
Here is why I ask. If you can recharge quickly than my advice would be to research providers that allow MSOG, this way you can get your first pop out of the way early, enjoy a bit of down time, and then have plenty of time to have a more leisurely second go at it. So if that is the case I would NOT advise rubbing one out before a session.
Now OTOH, if you are kind of a "one and done" kind of a guy who needs more than 10-20 minutes to recharge then it might indeed be helpful to get the "easy one" out of the way yourself maybe the morning of the day you are having a session, giving yourself plenty of time to be ready to go again of course.
There are other ways of course to last longer, one is to simply have more sex, but that's not an option for everyone. Another is to desensitive yourself a bit with a couple of drinks, or to take a small dosage of a ED med like Viagra which has the side effect for many of us who don't need it of making it harder to cum. Personally I hate to jerk off, I am pushing 60 and I only have so many orgasms left in me, I hate to waste any of them on anything less than a beautiful woman. lol