No it is not difficult to amend those returns. TurboTax allows you to amend your return for FREE. Here is how to amend your return.
No the state that you have already filed will not cost additional to amend. When you update the federal it will allow the state to be amended at the same time. Should happen automatically.
Use the attached link for an article on amending: How to File an Amended Return With IRS
If you used TurboTax Online, simply log in to your account and select “Amend a return that was filed and accepted.” If you used our CD/download product, sign back into your return and select “Amend a filed return.” You must file a separate Form 1040-X for each tax return you are amending.@GB38
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