To become a Proofreader, you'll need:

sound knowledge of spelling, grammar and punctuation

a sharp eye for detail and the ability to concentrate for long periods of time

to work neatly and accurately

organisational and time-management skills to meet deadlines

to enjoy working on your own

good communication skills when dealing with clients and Authors

IT skills

knowledge of the processes involved in producing books, other printed materials and websites

Most Proofreaders are self-employed, so you'll usually need business and marketing skills.