"The problem with any will is that you can't know it's done wrong until it's too late to do anything about it."
many times this, especially if complex instruments are involved (trusts, insurances ,etc). My in-laws are still dealing with unwrapping the set up that was made in the 80s to make it 'right' (to ensure tax treatment of what they want to pass to their children) and after 5 digit spend they are still not 100% certain how the state/IRS would actually treat it even after all of the legal opinions and language and transfers they made. not a good situation.
get it right, first time. the money you will save longer term would be so much worth it.