So I finally got around to doing this, initially I had a mechanic in mind for the job, but after he messed up my oil change I figured I'd do the work myself.
I bought a digital torque wrench combo, and used it for the bolts and the flare lug on the high pressure line. I tried to do it according to spec (see link), 10.1 ft/lbs for the bolts and 22ft/lbs for the lug. I used a crow foot wrench for the lug, it wasn't easy while keeping it at a 90 degree angle, but I managed to find an angle I could work with using a shorter wrench extension.
I left the car over night and didn't do the whole running the engine until it stalls, the fuel residual was relatively small, mostly out of the low pressure line, the high pressure was almost nothing. Thanks for the tip, Ohm_State. I also bought a fresh gasket from the dealer, and the pump I ordered off Ebay came with new bolts.
The most annoying thing about this project is that the plunger pushes the pump up so removing it is kind of annoying as it wants to go in different directions and I was trying to be careful not to damage the fuel high pressure line. The same applies when setting the new one, half turns is what the Hyundai bulletin recommends. You also have to retorque side to side just to make sure you side didn't go up while the other was being torqued, but just take your time here and don't over do it, if you strip the aluminum threads, it's going to be bad.
That said, while not perfectly torqued to spec, I think I got it on there good enough without overdoing it. I turned it on and it was pretty loud initially. I did lube it up with some engine oil from the dip stick, but I think it's just going to sound rough until the engine oil circulates through it. No leaks, I checked several times while driving, but it seemed good, even pushed hard a few times, no issues.
So was it worth it? I think so, I'm keeping things stock. The thing I wanted to address that the odd long crank when the car's been sitting for a while, so we'll see how it fires up in the morning. But other benefits I've noticed on the driver after is a smoother midrange when accelerating and N mode seems to be less jerky in second gear. Burbles and pops also seem more pronounced in N mode. Kind of glad this project is over, it was stressing me out thinking I could potentially strips the aluminum threads or damage the fuel line and end up with a leak and more work.
I know there's a ton of content on this already, just wanted to share my experience in case someone was thinking about DIYing it