IMO the best way to learn chambering:
1. Go to tutorial in native, fight with trainer bot, learn chamberblock mechanics.
2. Go to nditions duel server, fight with bots there. Learn how your ping change timings of your chambers.
3. Go to crpg duel server, pick your favorite weapon and ask somebody to attack you at random moments(not constantly spamming, but sometimes just stand and suddenly attack).
4. Fight with random players, using only chambers. It is the hardest and maybe frustrating thing, because people will use fast fients, delayed attacks and footwork to kill you, but it's very good! It will teach you to keep all your attention on your opponent, you will learn when you can chamber and when you should reset your attack and block.
5. Try to implement chambering in your usual fight style, for example you can try to chamber every third or fourth attack of your opponent.
6. Repeat paragraph 3, 4, and 5. For example after you launched cRPG you can go to duel server, chamber random weapon attacks with your buddy, then do paragraph 4 and then 5, then again 4, then again 5...
7. Change your fight tactics so that you force enemy to do predictable, easy to chamber attacks.
8. Enjoy all QQ from some not very skilled players like "You just a stupid spammer!!11" or "Y u no look at all my fabulous macro fients and just kill me after my first swing?!?!? :'((("
Good luck, I hope this little guide, written in terrible english will somehow help you