YouTube has excellent training
I suggest spending a lot of time playing with your unloaded gun while watching TV. Read the instructions and open and close the cylinder again and again. Many revolvers do not have a safety so buy a trigger guard or cylinder lock or improvise something simple. During a home invasion there is no time for loading. If kids visit, unload the gun and lock it away. Parents have a real dilemma.
Assume you bought an easy to use 38 caliber revolver shown in previous articles
for home protection only-you can then go to the gun range and buy a small box of ammo, pay for the lane; rent eye and ear safety equipment, shoot 12 rounds, unload, and go home. You will then be 50% trained. Gun Range Link
Conclusion: Using the 80/20 rule of business (you can learn 80% of a subject in the first 20% of time; use the remaining 80% of time to become an expert), I have enough knowledge for home defense. Fortunately, a retired policeman buddy gives free lectures and visits gun ranges with his trainees. Be safe out there.