It's easy to make it "Threading a Sewing Machine" but my daughter's Singer is not the same as any of my machines. Hers has a built in bobbin holder, where you just drop a bobbin in. Mine is different, and it's the only other one I've had experience on: It has a removable bobbin holder which is very common I've noticed. Also very expensive. A couple of months ago I went to a sewing shop in Thornbury and she charges $20 for a new one!! I didn't get it and a week or so later I'd bought another machine from the tip shop and it had some spares.
The bobbin tension is a real pain in the proverbial if you don't get it right, but it's really quite simple once you've seen it. There are a great many videos made that are on youtube and instructions just about everywhere, but rather than recommend one of these (you can Google for yourself I'm sure) here is my brief guide, using my partner's new (?) machine ($2 at a garage sale - yes really, but I had to clean it, oil it, grease it, give it a base and test it).
Before threading your new old machine, give it a really good clean. Thread carries and creates a lot of dust which gets stuck everywhere thread goes. The thread path plus the feed dogs and the bobbin case. All the Pinnocks I've had so far have an easily removable bobbin case, so remove it and remove all the dust and bits of thread.
And that's how to do it. Not hard but trial and error is a harsh teacher, so I hope I've saved someone some time.
EDIT (thanks Greg Livingston): Download the manual here