And then I found a video on Youtube describing how to turn a bitmap image into a vector image using a free program, Inkscape (upload your image, select it, click 'Path' from the top menu, then 'Trace Bitmap'. It drops the new image right on top of the original, so pull it aside to see how it came out and fiddle the numbers until you are happy). Bitmaps and vectors mean nothing to me, but I realised that they were saying I could put my drawing into this program and with the click of a single button (kinda!) could make it so I would never have jagged, pixelated lines again, no matter how little or large I make my image. All I ever wanted were neat straight lines!
Well, Inkscape delivered. Here's a pic of the Evolution of an Image, from my painfully simple I-can't-go-through-all-that-again pre-Inkscape hand drawing, to the final Inkscape-tastic piece...and yes I do say so myself, just look how sad the first one is!!!
I was really surprised that I caught onto Inkscape 'so easily' = at all!, because as I say the trial photoshop frustrated me so much that if Inkscape hadn't been free I just wouldn't have tried it. Meanwhile I have been working on a design for a t-shirt - it was complex, detailed, difficult...and I enjoyed it so much I made a second as well. That's for a separate post though - I bought a screen printing kit online and have yet to see how well it works. Oh yeah, I have never screenprinted before either!