Be cautious, get training, practice on heavily soiled itams, use different products, but work at the basics and be patient for a little while and you should get better and more competent.
If you gamble in this busines, the risks are horrendous, but you don't need to gamble.
Our 18 year old is about to start training, before we take him out, to gain experience, which will not come from our high value clients.
Angie