I was just down that road. My bearings were going bad so had them replaced, cost a little over $700. Wish the shop would have reccomended U-joints at the same time as 2 months later they needed replaced. Took it in to get an estimate and they said ball joints were bad also. Estimate for all was around $1500. I watched what I'm sure are the same videos you just watched and decided to do the ball joints/U-joints myself. If you will notice in the videos they cut off the video anytime they have an issue, so if you just watch the video it appears piece of cake, but in reality not so easy. Not to mention watching a video is so much easier than actually turning the wrenches. Of note you do not have to pull the hub/bearing assemble to do U-joint/ball joints. You can just pull the whole axle shaft out instead. I heard but never verified that the axle nut torque is around 600lbs and I didn't want to mess with that so just pulled the whole shaft/hub/bearing as one piece.
So as someone who has just went down that road I'd reccomend doing it all at once while you're at it, they all wear out and if one is bad the rest are most likely not far behind.
On my estimate they quoted the standard rate for each, they have a standard price for ball joints figured start to finish and a standard rate for U-joints start to finish. They did not take any hourly rate off to adjust for the fact that instead of doing 3/4 of the work twice they only have to do it once if everything is done at same time. Once you get a quote make sure they are not in effect "double" billing you.
As for the oil pan, I got nothing