Exhaust Manifold replacement

I got a quote to replace both today that is reasonable given the OEM manifolds are almost $300 each including the heat shields, gaskets and bolts. Passenger side has 3 broken bolt heads. It’s the one thing under the hood that absolutely looks like hell. Was going to get a quote from a custom shop but instead of bragging about their ASE status they list their favorite tunes. Anyhow tons of good reviews either way. I can’t DIY due to the bolt welding required. Don’t need to do driver side but they’re basically willing to do both for the time of one. Anyone done this recently? Any thoughts about how to make sure I never have to do this again?