Well as an example if I use 12iu slin pre workout I will eat my pre meal 90mins prior to training which will have carbs in ie ground rice, banana, honey and some fat to slow the transit down, 30 mins pre i would have 30-40g maltodextrin or whatever carb source you prefer with EAA's, I am lucky as I don't get overly bloated from malto. Then my intra would consist of 100g+ of malto with the addition of EAA's, peptopro and creatine. I am in a growth phase at the moment so I use slin pre and post workout.
Some people may disagree but I am not overly concerned with going hypo as its not hard to correct providing you have not messed up your dose which is pretty hard to do unless you're an idiot lol. For me its 20 minutes of feeling a bit crap with the shakes and bit light headed but after starting my pwo meal and cooling myself down a bit after 20 mins or so its gone. I always keep a lucozade or glucose drink in the car or gym bag just incase.
If in doubt if its an option for you then work with a coach and it removes a lot of guess work, I work with xjpx - Jordan Peters.