A clear text will be read more
There comes a point when you've spent hours preparing a text, writing the best English you can and you've produced something that is good, but now you need it to be excellent.
Proofreading is a mixture understanding the language and deciphering the meaning – then making the necessary changes so it's clear for the reader. It can be very difficult, but I've proofread many texts so you don't have to worry that it's too difficult. And when it comes to deadlines, if I agree to have it done by a certain time, it will be!