1) I’ve done more oil changes than I can count, on a dozen different cars. It is very unlikely that your oil change is directly related to the vibration, but you MAY have disturbed something in the process. However if the truck has been sitting unmaintained for 5 years, don’t blame yourself.
2) I don’t know about the oil filter compatibility. I always use OEM Toyota filters purchased from the dealership so I know they’re not counterfeit. When one of the Southwest dealers has their regular 25% off sale, you can buy these for about $5-6 each.
3) folks here may disagree with me, but don’t over index on the whole synthetic vs conventional thing. A lot of this marketing driven. These are Toyota motors, engineered to operate in bad conditions with varying quality resources. I doubt that owners in South America or North Africa give this much thought. What’s more important is regular oil changes with the right weight and volume, and a quality filter. If you’re curious or concerned, you can send a sample to Blackstone Labs and for $45 they’ll give you an analysis for metal particles, coolant, or contaminants that may suggest engine issues. Worth doing the first time you change oil because it helps you baseline your maintenance investments.
4) an oil change is probably the second most elementary maintenance after tire air. Good on you for taking ownership. FWIW I do it with the gravel shield off, since that’s an opportunity to check for leaks and other issues. I also pressure wash the bottom of the engine so that gunk is not obscuring my view and leaks have a clean “canvas” to show up on. It’s also a pleasure to work on a clean surface. Mechanics won’t do this.
5) with any fluid change, always verify you can add BEFORE you drain. Not as big a deal with engine oil since the cap rarely gets stuck, but if/when you’re doing the transfer case and differentials, crack the fill plugs FIRST.
6) NEVER crawl under a car with a jack alone. Use at least 2 known-reliable jack stands under the frame rails. When possible I additionally place 6x6 lumber blocks under the wheels. Lift only the minimum amount you need to access what you’re working on.
7) I have trouble reading the dipstick too. I admit that the first time I changed the oil, I drained/refilled 4 times

because the dipstick kept showing overfill. I finally measured out the correct amount per the FSM, ignored the overfill shown on the dipstick, and it settled down to “normal” after a couple of drives. I always let my oil drain overnight, so I may have emptied some galleys that needed time to refill.