I think there are a few problems here. When we first get bees we all want to watch them whenever we can so put the hive in a area that isn't always the best. There may be a good reason that the bees are a bit stroppy they have just lost a lot of their stores and are trying to defend what is left and with the way that the weather has been in the last week or so doesn't help. It could of course just be that they are grumpy old bees and the previous owner if he lived in the middle of nowhere didn't mind that .I think you are in for a fast learning curve here but by just asking for advice your going in the right direction.
Hey it's always good to ask for help!