Hiho, my background is pretty much if you can do it in club motorsport, I've done it in a Corolla. (Although success seems to be an option not included in my cars.)
In 17 years, I've never baffled a sump, and have yet to find the need to.
Get a 3/4/5K, put it in. Start giggling.
Here's a suggestion. start stockish, and do things one at a time. It is THE best way to learn about things; how well (if at all) various mods work, how worth while each are, how to do things cheaply on a budget etc. That's what we did with the V1.0 KE25 of mine as I had little money as an apprentice. We (Dad and I) just did stuff to improve the car as finances dictated. You don't have to do everything in one big hit. :P
Cheers
R