Very feasible! Electrical problems that only occur occasionally can be difficult to fix, as you can't really tell if you've fixed the problem or if the problem is just not happening right now. Don't let that put you off though, electrical things are usually quite simple to fix, just keep replacing parts (which are cheap-ish) until it's fixed. If you're having problems with windows then switching the switches (hehe) for new ones could be a good place to start. Remove interior door trim and check all cables are in good condition and not getting squashed etc.
As someone else said, getting a Haynes manual is an excellent idea. I've had one for every car I've owned, and they've been so helpful. This is the kind of thing you're looking for: http://www.amazon.com/Honda-Accord-1998-2002-Models-Manuals/dp/1563925389/ref=sr_1_1?ie=UTF8&qid=1438341354&sr=8-1&keywords=haynes+accord
Difficult to say for sure if that's your car without knowing exactly what car you have though :)
>I found out it might need a new battery, possibly oil and brake fluid for sure. What are the best options for those items?
Use what Honda recommends. You'll want to avoid using anything other than what Honda recommends.
As for the hood. I can't imagine it being anything more than a broken latch or cable. I only know about changing latches on a 1980 chevy pickup so I wouldn't know anything about Honda's latches. You should be able to do it at home.
>What items do you always have in your car?
Long length Jumper Cables. Better extra long cables than having to manuever cars around with short cables.
GPS
Copy of driver license in case you forget original.
Portable tire air pump.
Tire pressure gauge.
With any car you'll want to do preventive maintenance, which is checking and servicing a car to prevent problems in the future. Preventive maintenance is very simple and can be done at home. Having the owner's manual or the Hayne's Repair Guide is the first step to preventive maintenance. However, you can do preventive maintenance without those two things if money is an issue, but it is preferred because they detail what items you may need and when its time to clean/replace a part.
Put a side a day in the week to do preventive maintenance. If you don't have an entire day to spare then just put aside 30 minutes. The maintenance itself shouldn't take more than 30 minutes but if you find a problem that needs to be done in a shop then having an entire day free helps. Now onto the maintenance itself:
Check oil level. It should be between the minimum and maximum marks. Time to change oil will be listed in owner's manual or Hayne's guide. Make sure the it is the recommended oil and has this stamp if in US. Don't worry about "5W-30" in the picture, its just the type of oil and will vary. The type of oil needed is on oil cap.
Check the tire pressure, including spare tire. If you don't have either books then the info is on the door. Spare tire pressure will be different than normal tires.
Check tire tread. If they're flat or cracked then replace with a spare tire. Never drive with a damaged tire.
Check fluids in car. Make sure the engine is cold before checking coolant level. Once filled to correct levels, they should be fine until the recommended time to change them. If fluid is being lost before the time to sevice them then you may have a leak. Never use water in place of radiator fluid.
Check blinkers, headlights, and brake lights.
You'll want to change or clean air filter once you buy the car. There's not much to preventive maintenance and is just a simple process to detect problems or prevent them.
If you're interested in modifying your car then my recommendation is to put your money on brakes, wheels, and suspension. Wheels are what keep your car on the road, affect how it handles, and also engine perfomance. If you don't have good tires then no engine can help you. Everything else is probably best left stock depending on your preference.
One last thing, you'll want to have a trusted mechanic to go to. Find a mechanic that you can trust and afford. Do research and ask people you know which mechanic they go to. Don't be afraid to ask your mechanic questions about carsespecially if you're interested in modifications.