Can I apply for guardianship for my dad without lawyer help?

Are there other siblings in the picture? This has the very good potential of having sibling question your motives and use of dad's money. Just make sure you document, document, document! Keep all receipts, create a spreadsheet showing where dad's money is being spent.

Do you have durable POA for your dad? Is he competent to sign such a document? If so, then that is much less expensive than going for guardianship.

Contact the bank and they will give you a form for him to sign and return. A Guardianship definitely requires a lawyer and evaluation of your father to determine his competency. You will be background checked and have to appear before a judge.