Thanks again everyone.
Having read what you guys have told me, been watching a few Youtube videos on SMD soldering since I was last here (been sick since then), and despite having not done it yet, I think I will end up preferring SMD once I get kitted up with all the necessary tools and materials. It looks like it will be a lot faster than through hole. I use my "Inspector Gadget" headband magnifier when I'm soldering TH so I'll probably flip down the 2nd lens when I'm doing SMD, but I can see one of those magnifying lamps being a much easier way of doing it. You're always flipping the headband ones up and down and it gets a bit irritating.
If this little venture goes anywhere I can see myself rigging up a little component hold down frame, where the PCB is fixed in position and there's an arm you can quickly move to any position on the board to press down on a component and hold it in position while it gets soldered. Maybe something like that is already out there.
I've just compared my through hole 2N7000 FETs with their 2N7002 SMD brothers, and wow, how can SMD be so much tinier, OR why on earth are through hole so big to start off with. The interesting thing I noticed however, from looking at the data sheet, is that the SMD "equivalent" can have less desirable specs. I'm prototyping my board with TH components but I'll probably have to get an SMD board professionally made and "hope" everything works just as good. Has a "Eureka" moment with thoughts on the circuit so I'm back at the schematic stage making improvements to make it easier for the end user, and also make it available to a wider customer base.
I'm starting to see why those little PCBs are not always so cheap LOL.
Keith.