Funny thing is that on my crank bolt it was loose when I got in there. The balancer was a real bear to get off. I used a 2 arm pulley puller because 3 of the pulley bolts were sheared off. It would have been a lot easier with a 3 arm puller as there are 3 lugs on the pulley. There is a harmonic balencer puller that will help. I had to use a lot of penetrating oil and light taping with a hammer over 4 days before it would budge. If you have an Auto Zone near you they have a "free loaner" tool program where you pay for the tool and then return it in good shape and get your money back. I can not help out on the crank bolt.

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Currently
1991 Mazda Miata 174000
1991 Subaru 189,000 Winter beater

got rid of:
1984 VW Vanagon 195,000
1976 350SE Euro 185,000 KM
1973 280SE 4.5 (boy do I regret that)
1980 280SE European W126 4 speed manual (miss it)
1989 BMW 735iL 119000 (good riddance)