I think you'll be fine. I'm covered in scars and epilate no problem, but admittedly they're not huge. FWIW, I find epilators weirdly relaxing but I'm weird.

not going to lie, it hurt a lot the first time... but everytime i redo my arms, it hurts less, though i have to also admit i miss the pain a little ^^'

i think those scars ought to be fine .. if in doubt, use tweezers near them instead, takes longer, hurts less, but eventually the regrowing hair will become thinner, a little, and then you can just use the epilator there too... i do it like moving the device into the hairs along the skin untill it hurts, then i pull back and lift off so it doesnt touch any more, repeat. also make sure the hair you epilate isnt to long, the longer it is the more likely it snaps, instead of being ripped out :3