For bettas, normally I use a ten gallon with no rocks, no sand, just an empty base so the male can catch the eggs. A lot of plants would help, a grounded plant as well as some floating plants because the female needs places to hide, and occasionally the male. A foam cup that the male can start to build his nest around. A heater, if you use a filter, sponge filters are preferred by most; currents can disrupt the nest.
As for the fear of losing a fish due to a breeding attempt. What you can do is place the female near the male to see how they react. Obviously the male will flare at the female, sometimes the female will flare back. If the male proceeds to build a nest, then you're in luck. Though what you should do before attempting to breed is for about two to three weeks condition your pair.
Feeding live foods, brine shrimp, blood worms, etc. will encourage breeding.
During the event of introduction with both male and female, they will flare at eachother, swim along side, though it may be beautiful at first, there will be a chase and nip. I believe once a fish is bred it can no longer enter the show circut, i'm guessing it's due to the way their fins get torn; since they will never grow back the same.
Aside from that...
just try researching on the breeding as much as possible, it's always good to make sure you have more than one conditioned pair, just incase the first attempted pair don't get along or get a little too violent.
hm...