Find a recommended fitter – job done.
My Civic was a walk in the park. On paper. In reality the fixed bolts for the bumper bar all sheared when removing the nuts. No problem, drill it out. Now slip the new bolt in via – the inside of the chassis rail. Fantastic.
Took it to a place who could fit it quick, wish I’d just gone to the usual place my old man uses as they were of the “whoa don’t ask!” variety when I enquired as to how they managed to get the bolts in. (as expected they had cut the chassis rail to slip them in, wouldn’t have been so bothered if they had just come clean).
So yeah, take it to a well rated place and you’ll get a neat, proper job.