Just picked up a Horton Bone Collector really excited to get it in the woods I'll be zeroing the scope in a few days, I can not manually cock this thing to save my lift are they really that hard? I'm getting a scope put on my Marlin 336 picking it up tomorrow figured I'd pick up a cocking strap really didn't thank it would be that hard. What other accessories are a must have for a cross bow hunter? Thank!