Believe in your abilities
My advice is to not be afraid of the switch. Your neighbors, your wife, and your most of all, your pool chemical salesman with think you are nuts. Stay out of the pool store. Ignore them all and you will succeed.
Step 1. Read everything on the Poolsolutions.com website. Everything. Print it and reread it.
Step 2. Buy a decent test kit like the PS233 on the website or whatever new version they are selling. When you use the test kit, write down your results so you can see the effect of your work.
I bought my 10 year old home with an inground pool three years ago. The first year, I did everything the pool store told me to do. It couldnt have been more of a hassle. Their solution to everything is to add more chemicals and come back tomorrow with a new water sample. It cost about 75 bucks a week.
Stay out of the pool store. If you insist on using "pool chemicals" to appease nay sayers, at least buy them at a large discount retailer, never at the pool store. Lowes, Home Depot, and Walmart sell all the pool chemicals you could ever need. Still, its best to just use Borax, Baking Soda, and Chlorine Bleach from any cheap big box store. Get Muriatic Acid from an old fashioned hardware store in the masonary section, or get it in the paint section at your local home improvement warehouse. If you do not believe this site, then go to the arm and hammer website, they will list a dosing schedule for using baking soda. Similarly clorox posts pool information on their website. The muriatic acid bottle will also list dosing rates. You can also simply google any of these chemicals. Last year, I bet I didnt spend $100 total on pool chemicals the whole season.
A couple things which I did NOT learn early on.
1. Cloudy water is often the result of a dirty filter. The pool store told me to change my Diatomaceous Earth filter twice a season, but my water always seemed cloudy so they wanted me to add more chemicals. DE costs nothing at Lowes. About $15 for enough to last all season. I now change my filter the first of every month. Some people say it may be too often but again it costs nothing and my pool sparkles.
2. Baking Soda raises alkalinity. Acid lowers pH and and only lowers alkalinity temporarily (sort of). The point being, make slow changes to your pool chemistry and dont get on a roller coaster of fighting pH and alkalinity with acid and baking soda. Read the posted information on aerating to lower alkalinity if it is a problem.
3. An ounce of prevention is worth a pound of cure. If you have a pool party with 15 ten year old boys, shock the pool immediately before you close it for the night. By adding your chlorine in a timely manner, you will eliminate 90% of issues related to low cholorine.
4. Use and believe your test kit. If the test kit results are good and if the pool water looks good, forget about it and go swim. Do not over think the process.
Good luck