Even with an understanding of the horizon line with its point(s), and a reference element using squares to aid in proportions, drawing a perspective from scratch can still feel a bit daunting. Tip 5 can help.
A photograph can be a great friend, and drawing on trace paper layered over an image is perhaps the simplest and most efficient method. When I first started at FXFOWLE, I was somewhat computer-phobic and did whatever I could to avoid using one, particularly by utilizing the copier as much as possible!
I oftentimes depended (and still do) on my more computer savvy colleagues to provide computer generated underlays. However, both photographs and underlays provide a head start that can tell you exactly where the horizon line and point are located so that you can extend and construct your perspective quickly. A final hand drawn rendering can be traced on top.
Two and three point perspectives can also be achieved using a photograph or underlay. Remember to use a reference element and look for squares to complete the perspective.
Once you have a perspective laid out, it becomes a great tool for exploring the many options in the process of conveying your ideas. Photoshop has now replaced the copier for me, allowing me to manipulate my underlays and final perspective. I am no longer intimidated by the computer and instead, I cannot imaging life without my friend.