Right definitely do all the GI from under the playfield with a magnetic driver. For rubbers you will have to remove every ramp except the main low one to the left(that starts combo). You can just loosen that one to get around it. You can fully loosen the other ramps to get around them too. I did all my rubbers on Creature two weeks ago, took me roughly 2 hours since I like to go slowly. It wasnt as bad as I thought it may be but it was definitely more tedious than other pins. If you're not removing everything from the top you have to be a little creative for a couple of them, but it's not too bad.