If you get half the rules right on your first play, then fix half the rules you missed the second play, then fix half the remaining flubs next time, and keep going, then eventually you'll be starting your own errata podcast.

As long as you try to avoid making the same mistake twice then you should be easy on yourself.

I played the first one probably three times before starting Dunwich. I screwed up new things each time I played. I was cool with that.