When working on the stock, the forearm needs support. If you do a search, you should find pics of benchs that some people are using. Some will use a vice on a corner of a bench and then make a brace or stack blocks of some sort to support the forearm with the butt stock held in the vice. Some folks use two versa-vices which seem like a nice setup. Inletting the barrel is a pain but part of the process unless you are working with a blank that has been machined to accept your barrel, with precarves they are almost always tight. Yes, some can have wood movement requiring more work to inlet because of warping, that can be caused by many factors like how long ago it was machined, whether the forearm was supported to hold it straight, humidity levels,....doesn't make a stock un-usable. I've got a work area that is humidity controlled year round and I always allow stocks to sit long enough to acclimate (couple months). I've only had one precarve that couldn't be used, I bought it knowing it had a slight twist in the forearm since the price was right (very cheap), I blocked the forearm hoping to straighten it and let it sit for a month, it took off even more. That's the nature of wood. As a side note, I use a course square file for opening up octagon barrel channels that I have bent the tang to use as better handle, just heat till red and carefully bend it.