Fairly easy but takes some getting use to. Keep it chlorinated, shock as needed (do some reading on this, depends on time of year and how much activity it gets), keep it brushed and backwash it frequently to keep the filter in good shape (don't forget to add DE after you back wash). Hopefully your filter has a pressure gauge. If so then note the pressure right after a backwash and when it gets 10 psi above that its time to do it again. You'll need to make an entry in your budget for chemicals and misc stuff because much like golf, retailers assume that if you own a pool then you can afford crazy prices!
If you want to get into more complicated stuff you can learn about maintaining your Polaris (if you have one), completely cleaning the filter (taking it apart and hosing it down) and other things like replacing seals and valves.
2 of the biggest things I have seen friends of mine miss:
1. When you backwash you have to put more DE in the filter (if you have a sand filter or something more complicated then definitely hire someone). Backwashing is the act of removing the existing filter material and junk it has caught and flushing it away (usually into the sewer but older pools dump into the street which is bad if it is DE as that stuff is toxic). So if you just backwash and do nothing else then your filter is not going to be effective.
2. Do not forget to clean the Strainer. This is a small basket right in front of the pump. This is different than the Skimmer baskets. Those catch big stuff but little things will get through. The Strainer, much like a pasta strainer has smaller holes and protects the pump. If this gets full your pump will have to work harder and will shorten its life.
By the way, I am just a homeowner. Not a pool professional but I went through the same thing 6 years ago. Now I am pretty proficient at all the things I mentioned. Even repaired several broken parts on the Polaris (saving hundreds at the pool store), repaired my booster pump for the Polaris and many other things I never thought I would be able to do. YouTube helps with the details but a lot of it is just paying attention and putting some time in.
Bonus tip: When shocking, take out the Polaris and the hose as the Shock will eat away at them and shorten their lives as well. After a couple hours of circulation you can put them back in.