Another option is to use
rtmpdumphelper, which automates the process so you don't need to manually type all of those different parameters.
I'm pretty new at this too and I find rtmpdumphelper really useful, but it doesn't work for every site. I think it is still valuable to download a sniffer, learn to use rtmpdump or ffmpeg, and learn to manually input the parameters. I'm still learning all of this myself. It's definitely not easy but I think the value of learning this stuff makes the hard work worth it.