for plugs its pretty straight forward tool wise.
1- Twist the plug wire boots first (part attached to the plug) to help keep from tearing the boots.
2- get good plugs (LOL, I use Bosch Platinum but others here dont like them much)
3- check the plug manufacturer to see if Gapping them is needed (check them when taking them out of their packages for closed tips)
4- when installing them careful not to hit the tip on anything hard so you dont mess up the gap
5- also dont get too carried away tightening them, read the box.
6- careful when using the socket, if it slips its possible to crack the insulator of the plug causing a misfire
7- check the wires too they are important if they are oily clean them or replace them with a good set (1 by 1 to keep from crossing them) I like Spiral Core wires (much less resistance)
1- do it while the engine is warm (warm oil flows better than cold)
2- I fill the new oil filter with oil before I install it (it helps the engine from running dry a little more)
3- make sure the old oil filter gasket comes off with the old filter (sometimes they get stuck and 2 gaskets is sure to leak.
4- get a good filter (I used to buy really cheap ones but a good one is way better made)
I like WIX and Napa Gold for my car.
5- Oil is a preference thing. Back in the day they used to sell cheap and good oils. Now pretty much all of them are good. I think its more important to change around every 3K miles than what oil you use.
Some like synthetics but if you arent taking ur engine to the edge every day than any oil a retail store sells should be fine.
6- DONT FORGET to recycle the old oil. Most auto part places take it.l.
BE CAREFUL to support the car when you are under it. Have FUN