Hello Steve,
The biggest obstacle to making them is if you decide beforehand that you can't do it,then there is not really much chance! When I first saw a miniature by Donald McNarry in 1968, I thought "I wonder how he does them, I will make every effort to find out!" I contacted him by letter, and he was good enough to reply, pointing me in the right direction. I went from 8 feet to 1 inch down to 32 feet to 1 inch literally overnight, and found it much cheaper, quicker and easier from the start! I will be leaving the free download online, so it will still be there when you get back. As for the other downloads, the introductory ones with quite a bit of info, and well-illustrated, range from £1.49 each for the simple ones, to £4.99 for the more comprehensive ones and finally £8 for the download version of the printed book.
Take a look at this: **LINK**
It is NOT my site. This man obtained my Steam and Motor Ship download, that contains plans, and all the information to build a miniature of the motor tramp Glenmoor. As you can see, his very first model (Glenmoor) is actually indistinguishable from mine. But we have never met, and the only hand I had in the model was producing the download imparting the knowledge on how to do it!
Bob