How to Find a Beta Reader
One of the questions I am often asked is whether I would be prepared to be a beta reader. When I (usually)) turn the request down, I try to give some advice to the author about finding the help they'd like.
First of all, define what it is you actually need. For some, it's a question of britpicking. For others, they may want help with plotting or characterisation. If you are a non-English first language writer, you may want advice about grammar, usage, and vocabulary. (LOL! That can also be true about native English speakers, too). Or maybe you just want a cheerleader, someone who can point out the bits that really thrilled them, giving you more confidence to write.
So, once you've clarified what you need, what next?
Firing off a request to someone who has not read your stories, given kudos or commented is the quickest way to get a refusal. Putting up a general notice on one of the chats (discord, tumblr, etc) may get some response, but it might not.
I can tell you how I became a beta reader- and then a collaborating author- on three occasions. I was enthralled by these three author's work, commenting on every chapter as it came up, squeeing in delight at their phrasing, the plotting, the characterisation. I was INVESTED in their work! And I was the one who chose to cross the line- I messaged (NOT in a public comment) about something they had written, suggesting something constructive- that is what a beta does. When the response was positive, the relationship was born.
Give as good as you get. Beta relationships work best when they are mutual. I show them my work; they show me theirs -in draft, with an open mind about how things could be improved. Best results come from trust and affection, even if it involves tough love.
My own writing is made better by my betas. I strive to help those I beta write better, too. This community works best by reciprocal love.