To achieve flawless nails using Shills Professional Gel Polish, start with clean and shaped nails. Begin by applying a thin layer of the base coat, ensuring to cap the free edge of the nails, and cure it under a UV or LED lamp as per the manufacturer's instructions to ensure adhesion and longevity. Next, apply a thin layer of the gel polish color of your choice, covering the entire nail surface evenly from cuticle to edge. Cure this layer under the lamp again. Repeat with a second coat if necessary for desired opacity and color intensity, curing each layer. Finish with a final layer of top coat to seal and add a glossy finish, curing it under the lamp once more. Remove any sticky residue with isopropyl alcohol or gel cleanser and moisturize your hands for a professional and durable gel polish manicure.