I don't know of any way to remove confident, but if you can boost your Inspired to a higher tier you can over power it. The higher level emotion will be dominant, so to "get rid" of plus 1 confident, try to get to plus 2 or higher in the desired emotion. One tip for the Kids "Wiz Kid" aspiration is to place their homework on a desk, in a room with some focused decor. This will keep their mood focused when they finish the homework and prevent the last minute switch to confident from preventing the credit for "finish homework while focused" requirement. Similar tactics can be used for other situations. Set up "mood rooms" by loading them with decor that gives the dominant aura for the associated tasks. Almost all of the careers give aura items as rewards, and there are many ways to get inspired buffs/auras. The free post cards from pen pals are an easy one to obtain in the early game. I like to hang them around the kitchen and around my creative objects to help maintain inspired. The random confidence moodlets can be a pain, but inspired is probably one of the easier emotions to achieve, because there are so many ways to do it.