Acura TL type S coil pack &spark plug help

My 2008 acura tl type S which i had for since 60k miles and now at 75k. The other day i noticed the car making a pounding noise coming from the exhaust and soon to have a check engine light P0305. I ran the code and it said it was a misfire in cylinder #5 so when i tried to take out the coil pack it is stuck and unable to move. I then broke off the top of the coil and now there is 3/4 of the coil still stuck in there. How would i get the rest of the coil out? Do you think i would have to replace the head?

Thanks