Help me understand difficulty of ownership

How is owning an A Body in terms of part availability and repair work? Is it something that is feasible for a beginner like myself?
Not too bad, some parts are harder to find than others, but that is to be expected with 50+ year old cars. Sometimes it's the hunt for parts and discovering the cool stuff you can do that makes it enjoyable. Just make sure you buy something solid and maybe original since you are at a beginner level.