I have an older PDF sheet with about 100 questions asking for yes/no responses in boxes. I know I can do check boxes or radio buttons to click on them, but because the boxes are already on PDF sheet (and they're rather small), I'm having a hard time matching box size. Is there a way to just put a check box or radio button in the already typed box without having it add a box that I have to size???
No. The way pdf forms work is that you will need to add the pdf form fields on top of the page fields. Although it may not look excellent, you can zoom in on the pdf page while adding the fields and this should make sizing the fields easier.