Can kalanchoe plants go outside?
They can go outside in the summer but they're not frost hardy so don't put them out until after the last frost and bring them back in before the first.
To start with don't put them in brilliant sunshine - as they've been indoors they will get scorched in very strong sunshine - if the sun is very bright start them off in the shade, but when they get used to it they're fine in the sunshine, although they are also happy in shade.
If there is heavy rain check that the pot is draining well - they do not like to be waterlogged.
Sounds like you're not hopeless at all! : )