1. Yes.
2. It depends upon the availability of the office.
3. Yes you need to print and fill up the form. Book a personal submission of the documents. Payment details can be found in your FLR form.
I've done mine via a post and there wasn't any problem at all. Just waited for 8 weeks then I received my documents back and my biometric residence permit card.
Mind you, there's no guarantee that you'll be granted the visa immediately if you apply in person or the premium service of application.The application will still depend on the documents you have provided. Besides, submitting in person is much more expensive than sending the application via a post.
Anyway, it's all up to you. Just giving you an idea since I've been there.
Good luck with your application. :-)