DIY Heating plus Air Conditioning cleaning breaks system

I was learning online how your Heating plus Air Conditioning system should be cleaned out and maintained once or twice a year.

I am kind of handy with a tool belt so I decided I should just do it myself.

I watched lots of videos and learn up on everything. Then I got to work with my tools, a vacuum and some oil. I took my time and was unquestionably careful however when I put everything back together, my Heating plus Air Conditioning system simply would not turn on. I took it apart again and looked at all of the connection however everything was right. I knew I had to call in the professionals. This was over my head. A real Heating plus Air Conditioning supplier came out the unquestionably next day and the serviceman took one look at my Heating plus Air Conditioning system, flipped a switch on the side, and said, “well here is your problem.” I felt so stupid. I had simply turned off my Heating plus Air Conditioning system like you might turn off a light switch. The switch must have gotten bumped when I was moving things around. It might have even gotten caught on the cleaning rag or something. I did not even know there was an off switch, other than that, the serviceman said I did a wonderful job cleaning, for the most part. She gave me some hints and tips for next time but she also indicated that her supplier cleans Heating plus Air Conditioning systems for unquestionably little money. It sounded like a wonderful deal even though I kind of just want to do it myself. How else will I ever learn?
mini split air conditioner