well, first off when it comes to your tranny, make sure that its actually dead first, unless you just want an excuse to dump some money on the car and make it a bit faster.....
try changing to synthetic fluid, and make sure you get a full flush....it may just be really realy dirty fluid....
but if your tranny is fucked, then a tranny swap shouldn't be too hard for you, mostly because you have a 4cyl which means that the tranny is easily available, and you could pick one up in some scrape yard and then bring it to a mechanic that is willing to do it for you.....
or even maybe do it yourself.....
for engine swaps.....use the search button, cuz then you'll get an idea of the full possbilities and.....well, the restrictions....which there are many...