Write Your Plan Down
Many people don't take action now because they aren't sure where to start. If your plan is quite large, like a career change, it can be difficult to know exactly where to start. What helps with this is to sit down and make an outline of your plan or goal. Break it down into smaller, more manageable pieces. Then, start with the first manageable piece that you can do. For the career example, the first step would be to update your resume. Be ready to apply for new openings. Seems like having an up-to-date resume is easier to accomplish than only thinking and wishing you had a new gig.