I am not a pro, but I can do a pretty decent job with a torch. If I can do it, anyone can!
Just make sure to get the cattle really clean, get them totally dry, DO NOT put anything in the hair & have someone with a brush in hand standing by to put out any flare ups & to brush out what you singed off. When doing necks, I clip the face 1st, then I clip them real tight with 1 clipper pass from the chin down to the brisket... a medium or 7112 works good for this. I then block the top of the neck & make it as straight as possible up to the top of the poll using a blocking blade. After that I bob the tail switch (level with navel or back knee) & clip the tail/tail head like you normally would. Then I light up the torch & go to work. Just singe off a little bit at a time by placing the torch just close enough where it starts to singe the hair. Also, keep it moving & don't hold it in one spot too long. Use the torch to clip & blend. Somebody else may have a simpler or quicker method, but what I do works good for me. If you are just starting out & don't feel comfortable doing it, it might be a good idea to start out using a small propane bottle with a smaller flame until you get the hang of it.
With all that said, I prefer cattle to be clipped with a set of clippers if they are going to a show... although I know people who have shown torched cattle. But, I think that the torch is ideal for roughing one out as a quick & simple way to get them dolled up for pasture sales &/or pictures.