Swapping a wall console or a remote is fair game for most homeowners, and we won't talk you out of it. Installing the opener itself is a different job - it involves setting travel limits, aligning safety sensors to code, and often adjusting or replacing bracket hardware that was never built for the opener you're putting in.
On Westover's older houses, the retrofit issue we mentioned above is the real trap: a DIY install can go in and work fine for months before an alignment problem shows up as a door that reverses at random or a sensor that trips in cold weather. That's a callback job that costs more to fix than it would have to start right.
Our honest limit: we don't do smart-home integration beyond what the opener manufacturer supports out of the box. If you want deep home-automation ties, that's outside what we install.