I really want to start writing fanfiction but... the knowledge that my writing is going to suck and will be cringeworthy scares me so much that I just can't start. I have so many ideas for so many fandoms and have so many notes on them, but *actually* writing? sharing it with people? scares the crap out of me and paralyses me. Especially when I see how new writers get nearly no feedback at all and kind of have to guess what's wrong with their writing. Any tips?

When Writing

• Don’t post it until you’re satisfied. 
  
• Write the story you want to read and polish it until it’s just right. 
  
• Get your formatting, grammar, tenses, and punctuation to a clean standard. Online readers uniformally sigh with relief when a fic is tidy, even those that can enjoy any hot mess.
  
• Always take your time! Fanfic’s for the writer first and foremost!

Before Posting

• On whatever site you intend on posting on, read/review/follow like a normal user and establish a little presence there. 
  
• Post a couple practice one-shots, small things you don’t care too much about, just to test the waters as well as give readers an idea of the fandoms you’re into and the kind of stories you like to tell.
  
• Don’t post if you think it’s scary. It’s not, I promise, but don’t stress out!

After Posting 

• Never assume there’s something wrong with the writing because if there is readers will tell you.
• Low readership early on is normal.
• Usually though, readership will stay low because there’s something lacking in your blurb, tags, or other searchable/promotional aspects that should draw people to it in the first place.

General Posting Tips for Fanfic

• If it’s a small fandom, you may never get much traffic. 
• If it’s a currently happening fandom, time your updates to big events within fandom (when possible). Ex: if I post a Marvel one-shot about a movie that just came out, readership will go through the roof for that fic because it’s the first one out there.
• Try doing that once ^ just to get readers and feedback. It’s a great way to get attention fast.
• Rare but beloved ships can also get surprise reads from people desperate for that ship. 

Enjoy yourself. Don’t be scared. Take your time.