+1 on that... I had a complicated ISO options situation once, and that was the only time I used a tax advisor to help me take the return over the finish line. The only mistake in my taxes was in what tax advisor did; I was able to figure it out by reading the official IRS doc a week after filing. Luckily it didn't change the amount owed, the income was just in a completely wrong field according to the doc.

The docs are pretty well written...