It's important to make sure the things you invest in on monday are meaningful. It's not the moment to be throwing around money (or time) with abandon. Tuesday through thursday, you are looking into something, asking a lot of questions, making calls. Take seriously the advice of the people near you, especially people who approach situations differently from the way you do. Their perspective is valuable. That said, once you figure out your plan of action, you might not be able to move immediately. As much as you want to initiate a new project on friday, existing obligations could prevent you.