Newbie here so sorry for the newb question. I just bought a Nokon P22 Scope and the Nikon P rings. I don't have a vise to hold the 15-22 so I am wondering how to level the scope to the gun without one? I guess I could spend close to $200 for a vise, level level and whatever else I need but if there is a cheaper way, I would like to know. Thanks in advance for your advice!