There is a famous saying – everyone’s first draft is rubbish. It’s true. Even the greatest authors in the world will not write a perfect narrative first time round. Whether you type on a computer, or write by hand – let the story guide you. Don’t worry about the mistakes that inevitably will be there.
The flow of the story is more important.
Whether your first draft be on a notepad and pen (my preferred way of writing) or on the computer, don’t think you need to have it perfect first time.
Worry about the edits later.