Crimping bullets without a cannelure with the Lee Factory Crimp Die is extremely simple and nothing to worry about. Just set it up according to directions and crimp away. My advice is to start with a light to medium crimp. Although many handloader do not crimp and claim it is not necessary and will degrade accuracy, I disagree. Here is an article by Sierra on neck tension and crimping in auto-loaders.
When we stop to consider the vigorous (read, downright violent) chambering cycle a loaded round endures in a Service Rifle, it becomes pretty clear it suffers abuse that would never happen in a bolt-action. This is simply the nature of the beast. It needs to be dealt with since there is no way around it.
There are two distinctly different forces that need to be considered: those that force the bullet deeper into the case, and those that pull it out of the case. When the round is stripped from the magazine and launched up the feed ramp, any resistance encountered by the bullet risks having it set back deeper into the case. Due to the abrupt stop the cartridge makes when the shoulder slams to a halt against the chamber, inertia dictates that the bullet will continue to move forward. This is exactly the same principle a kinetic bullet puller operates on, and it works within a chamber as well.
To counteract this tendency, the semi-auto shooter is left with basically two options: applying a crimp or increasing neck tension.
I load for several auto-loaders and I use the LFCD on all of them. I have done extensive testing with increased neck tension vs crimping and I can tell you that IME increasing neck tension during the sizing process is a sure way to destroy accuracy. On the other hand, in most of my rifles crimping with the LFCD has Increased accuracy. I have yet to have the LFCD degrade accuracy in my rifles. I have a few rifles that in does nothing as far as accuracy goes, but never degrades it.
Follow the advice of the experts at Sierra and crimp or find a way to increase neck tension and still keep you rounds accurate.