Step 1: Make a commitment: Making the decision to lose weight, change your lifestyle, and become healthier is a big step to take. Start simply by making a commitment to yourself. Many people find it helpful to sign a written contract committing to the process.
Step 2: Take stock of where you are: Consider talking to your health care provider. He or she can evaluate your height, weight, and explore other weight-related risk factors you may have.
Step 3: Set realistic goals: Set some short-term goals and reward your efforts along the way.
Step 4: Identify resources for information and support: Find family members or friends who will support your weight loss efforts. Making lifestyle changes can feel easier when you have others you can talk to and rely on for support.
Step 5: Continually “check in” with yourself to monitor your progress: Revisit the goals you set for yourself (in Step 3) and evaluate your progress regularly. If you set a goal to walk each morning but are having trouble fitting it in before work, see if you can shift your work hours or if you can get your walk in at lunchtime or after work. Evaluate which parts of your plan are working well and which ones need tweaking.
Read more at: https://www.cdc.gov/healthyweight/losing_weight/getting_started.html