Having a vehicle means maintaining it, and there are all kinds of ways to do that. Some of the simplest things you can do for your vehicle include washing it and keeping it clean inside. It'll look better and last longer when you do that. You'll want to take it for the recommended oil changes and other maintenance requirements, and you'll also want to get any serious problems fixed before they get worse or damage anything else. If you're facing something signifcant, like transmission repair, it's a good idea to get it taken care of before further damage occurs.
Some people try to fix their own transmissions, but that's rarely a good idea. If you attempt transmission repair you could end up causing further problems and needing someone else to fix what you damaged. That's going to make the price higher than it would have been if you'd simply taken your vehicle in when it first started having trouble. Don't take it to the first shop you can find, though, especially if it's not a shop that specializes in transmissions. It's better to check around and find a transmission repair shop instead of taking your vehicle to a general mechanic that might not be as well-versed in the specific problem you're encountering. Although a transmission specialist may cost more, you'll usually get a guarantee - and the job will be done the right way the first time, which will save you money in the long run.
If you're adept at mechanical things and you do decide to fix your transmission on your own, take your time. Transmission repair isn't something you can do in an evening. Read up on it, and make sure you understand what you should be doing and how to handle problems that might come up. If you can't diagnose the issues that your transmission is having, how do you plan to repair it? The parts can also be costly, so be sure you have the money to purchase them before you start taking your transmission apart. You don't want to be without your vehicle for a long time due to transmission repair, and it's also not a good idea to leave parts sitting around and open where they could become lost or damaged.