Will Applying to Too Many Banks for Refinancing, Ruin My Credit Rating?

refinancing

its coming up for a year since i bought a strain new car from my dealership and i am being paid charged a 15% interest rate. i have found three banks/ credit unions that are charging minimum 8%. what i am worried about is, if i apply to all of them, apparently it can look terrible on my credit rating because i have inquired so many times. how can i tell if my credit is even worth their acceptance and how can i apply to them without ruining my credit rating?will refinancing look terrible too?