Yep the easiest way I've found to do it is just take out the core and shove a blow gun nozzle in to the valve and hit it. I have a presta to shrader valve adapter dohicky but it is more of a PITA to use than just hitting it with the blow gun. I keep thinking about buying a presta inflater but it always comes back to I don't do it often enough to bother.

And Larry incase the others didn't make it clear you can adjust how much air pressure comes out the hose so you don't slam a tire with 150psi. Think I normally go 50psi give or take.