Do the setup as accurately as possible, the better that is the less the error that the scope has to account for. Looking "about level" and "that's about North" just is not good enough.
We seem to just expect a small silicon chip and some software to do it all for us.
Set your own custom location, if not already done so or has the scope GPS?
Other ideas: Goto a nearby significant star, center that and synch the scope to that.
Then goto the planet.
Principle is that if the slew error is say 2% then if you slew across 50 degrees of the sky you can expect to be up to 1 degree out. If you start on a start 2 degrees away then you can expect to be up to 2.4 arcmin out.
But like the "do the setup accurately" it means additional time. And so much seems to be "I want it better, but don't want to put the effort or time into it."
Have said that the purpose of the alignment is for the scope to work out how badly we have supplied the data and done the setup. Can unfortunately mean that "Alignment Failed" just means we have done it so bad the scope has given up on us.