Couple things. Humalog lasts I think 2-3 hours? I use humalin R which by the way is non prescription in california and some other places. Humalog requires a prescription I believe. For me, I like to eat a meal sometime before I inject and then I drink skim milk right after I inject and until the 4 hours are up. It would be ideal to eat a meal about an hour or so after you inject also. These timings are for humalin R though, not humalog. I like humalin R because it will cover you while you are in the gym and after as a post workout nutrient absorber.
I would NOT start out taking it pre workout. It took me one 4 week cycle post workout before I started feeling comfortable running it pre workout. A lot of guys say unless you are a professional and REALLY know what you are doing, not to run insulin pre workout. I think you should be ok, but practice post workout first. A lot of guys inject 3 times a day and cycle 4 weeks on 3 weeks off. I only use it pre workout so thats only about 5 times per week. I used for 4 weeks, cycled off for 3, and have been on for 5 since I have been AAS cycle now.
Spend at least a month doing research before you start. Definitely buy a blood glucose monitor and it wouldn't hurt to have some quick digesting glucose drinks/tabs on hand. I keep a couple in my car, in my motorcycle, in my room, and in my girlfriends room.
To me, the IDEAL thing to use while on slin is skim milk. It has carbs and protein in a GREAT ratio, is cheap, and tastes great

I'll drink like 3 glasses right after I inject and then drink a few more glasses while I lift, and a couple more after. I mix in protein for some of them.
A lot of people say you will gain lots of fat on slin, and while it is likely, if you eat a clean diet you should be ok. I don't eat hardly ANY fat for like an hour or 2 before I inject and then 4 hours after I inject. Fat will get pushed into your cells just like the carbs, protein, and creatine that slin is known for shuttling into your cells.
Does anyone have any comments on if you need to cycle on and off if you are only using it once a day 4-5 days a week at 8IU. I am 185lb 7% bf.