HVAC service is just a matter of using tools and following procedures. It's not 'rocket surgery', but you can be injured or damage your car.
Here is the best guide to automotive AC that I have seen in ANY online forum:
https://honda-tech.com/forums/tech-misc-15/%2A%2A%2Aair-conditioning-c-guide-how-works-when-doesnt%2A%2A%2A-2900177/
I have the tools from Harbor Freight that Woody suggested and have serviced many of my own cars. I still review the procedures every time before I start and always wear gloves and safety glasses around that stuff (actually anytime I'm in the garage).
If you are considering servicing your AC for the first time, watch some YouTube first. You can probably learn more from watching idiots mess it up than you can from a pro doing it correctly.
