Hi, Lorax, & welcome to the forum!
In answer to your question, the 4700's touch screen works just like any other, in that it will recognise pressure regardless of what causes the pressure - so you can use a stylus, your finger, a broom handle, anything you like.
BUT...
You need to bear in mind that the whole of the area being touched by your finger registers as a 'hit' so if you need to touch a small & specific part of your screen then you're better off using a stylus.
To be honest, I quite often use my finger to operate my PPC - usually when I'm too lazy to pick up the stylus!

- & generally I have no problems. but when I'm doing more intricate stuff, such as scrawling notes, then I have to use a stylus.
Your best bet is to try & get some screen shots of the software you're going to be using & see from them if finger-touching is feasible.
A wise word to you - whatever you decide to use to touch the screen, invest in a screen protector!