I want to build a simple 40 meter CW transmitter and Receiver pair. What should I do to get started into home-brew HF RF devices?
I built a BitX 20a, which was fairly complex, but a really neat kit. If your soldering skills are ok, and you can wind small wire through tiny donut shaped cores, you will have a lot of fun.
The SMK-2 40m kit might meet your needs (40 meter CW), but it's surface mount. Don't be afraid of that, with a good magnifying glass, and some inexpensive chinese made soldering tools and some solder paste, it's easy.
I've found kits a great way to learn. I learned a lot trying to get my BitX to work, I found a few errors I made, but I learned a lot about the theory in the process. Don't be afraid to learn as you go!