I was so nervous uploading my first video. I was worried people were going to hate it and tell me to go die or something. =S But after I uploaded, literally no one watched except my hamster (er..actually just me lol). That might sound like a bad thing, but for me, it was like a huge relief -- no haters came! woot! lol! xD The next video was so much easier to upload. I think the first one is the scariest, but after that it gets a little easier. =)
My tip would be to just do it. Click the little publish button and don't look back (and maybe reward yourself with chocolate or something). ^^ It's easy to overthink things too much, but it's only your first video -- we all learn to grow from our first videos. ^^