Wouldn't it be ideal to get what you have sorted, if its running ok, upgrade or bring back to full reliability what needs to be, realize what more you need to learn (then learn it), realize how inadequate your toolbox is and then realize how much you need to spend on tools.
Then go for it.
I bought a basket case 54 Ford f100 as a teenager. Dad said it's a lot of work and I thought I could fix it. I had plans of grandeur. Sexy pearl color shifting paint job (it was that long ago), big block, mustang 2 front suspension, 9" rear, tuck and roll interior (so long ago), tilt front end, fuel cell tucked under the bed boards, dual carb tunnel ram, predator carbs (so so long ago) etc etc.
I rebuilt the kingpin suspension, threw in a junkyard nine inch one legger, vinyl interior, rebuilt the 289 5 bolt bell that was already there (already had a transplant from the y-block 292), learned how to weld new cab corners in, sand, prime, paint, scored a rebuilt c4 at the junkyard and upgraded to power brakes.
Point is I learned more just wrenching on what I have like, OMG, non power drum brakes completely suck on an automatic and my leg throbs at long stop lights. I sorted what I had and was pretty proud of it. Athough my high school friends loved to do th sanford and sons tune when I drove in. That was an f1 not an f100 by the way. spent lots of money on tools, realized what a budget was and learned how to measure a project based on number of expletives required to complete.
But there is the go with what makes you feel saucy, just sort what you have now and decide if you still want to take on a swap challenge seing as you stated you aren't a total mechanical genius but who is.
Then there is the I'm a hypocrit because if I lay eyes on a mk one Tina I will be going for a lotus motor, then see if there is a bda somewhere since that will fall through, then maybe think 2.3 turbo is what I am left with before I purchase and install the bda's bastard cousin for giggles (4age)
My reply is most likely useless...but there you have it.