With the crucial addendum that when you've ploughed through the form, make sure you sign the form fully inside the box provided. I made the mistake once of celebrating completing the form by signing it with a flourish - only to then have to do the whole thing all over again because my signature...
Would advise googling to see if the circumstances of your passport renewal require you to get the form and photos countersigned by an eligible person.
Would further suggest you reschedule your appointment until you get your documentation and your act together to save yourself a possible wasted...