Fundamentally we need common sense but even more than that I think anymore someone new to the hobby can have a .40 size plane set up over a wkend or two and then they are  operational.. When I started yrs ago  I spent the first 10 yrs in the hobby learning procedure and respect with an .049 and plenty of episodes of minor injuries taught those lessons... Nowadays a persons first machine is commonly an os max .46 spinning a 10x6 master airscrew at 13000 rpm - a poor place to learn new procedures.  Speaking of master airscrews, I love them in the air but they are a close relative of x-acto blades when it comes to hands and fingers![8D]