Did this for the first time last night with pretty good success. Seems like I always had a little bit of foam at the start when the wand is initially empty. I also had trouble finding a pressure that worked well.
I found that i had a little better success with a slightly higher pressure than what most say on here. I started around 3-5psi but seemed like i was losing some carb, 7-8 psi works real well for me, i set it wrong once at 10 and that was way too much. I also have about 7 ft of beerline before my picnic tap and im using a bottling wand i modified.