I prefer push-pull anyway, but I'll confirm what everyone says that if you don't do it right it is just as dangerous as they say.
I've got lots of practice; I'm teaching a friend to make Flemish strings and the guy forgets something at least once a month, so when I go over I actually have to remind myself not to treat his bow like I do mine out of courtesy. It works fine if you know what you're doing.
Hope this link can help you string your bow :
http://hunthacks.com/string-recurve-...hout-stringer/
Thanks all!