Slin is only dangerous if your an idiot and wreckless and if you are you have no business running it anyways. It very much needs to be respected. Slin is all about timing, period. If you cant time meals and nutrients properly then your wasting your time. Humulin-R is a little more forgiving than humalog being it's a little bit slower on release but I find it more manageable. It's also available at any pharm over the counter unlike humalog.
I've only been using it for a little bit, but i've only gone hypo once and thats because I didn't jet home after the gym right away. But anyone using slin should be prepared for that and have glucose tabs on hand, I like to keep pop tarts in my gym bag also as it contains plenty of carbs and dextrose and snack on those.
Humilin-r starts taking effect in 45min, then peaks out at 2 hours and is out of your system in 4-6 hours. I like to take it 1 hour pre work out, mix a shake containing 15g glutamine, 15g creatine, 15g bcaa mixed with gatorade to get my dextrose and a scope of waxy maize(carb mix). I'll sip on that through out my workout which i'm usually in and out in an hour. I have yet to go hypo during work out. Come home and have a protien shake and eat about an our later. Helps living not even 2 minutes away for the gym.
I am by no means an expert on slin, this has just worked best for me. There are many different protocols to study and one should really research as there's so much to learn on the subject. Rule of thumb is 10g of carbs per iu, most can get away with 5-7. Protocols will be completely different between humalog/humulin-r.