A proper install starts with the opening, not the door. We measure the frame, check that the header can carry the spring load for whatever door you're putting in, and inspect the track mounts - on homes from this area's main construction period, those mounts are usually original and sometimes need reinforcing before a heavier insulated door goes up.
From there it's new track, new rollers, a torsion spring sized to the door's actual weight (not a universal spring, which is how doors end up unbalanced), and the panel itself set and leveled before the opener gets reconnected. We test the balance by hand before the opener ever takes the load - a door that's balanced right should lift with one hand and stay where you leave it.
Last step is the opener's travel limits and force settings, dialed in for the new door's weight, plus a check of the safety reverse. We don't consider the job done until the door runs a full cycle clean, quiet, and square in the frame - not just closes.