Practice tons with a .22lr or something cheap in a variety of positions and find what works for you best. I have been practicing using the v on my sticks, holding the sticks and resting the stock on my arm, sitting holding the front stick while resting my elbow on the rear stick (very stable), sitting holding just one stick, as well as shooting without the sticks - offhand, offhand with the sling, sitting resting both elbows on my knees, sitting with 1 elbow on a knee and prone. I have also been practicing picking a hole through cover (focusing back and forth between the target and obstructions) All from various angles and various height adjustments on the sticks since they may not fall perfect every time. If you are relatively proficient and confortable from all those positions it wont matter what the circumstance the shot should come naturally.
Kuduman good call on not resting your barrel on anything, any pressure on the barrel will cause some degree of inaccuracy.
