FOR GEL POLISH OVER NATURAL NAILS: 

File the surface the nails to remove the shine of the nail polish. If desired, trim or file off some of your nail length. 

FOR GEL EXTENSIONS: 

Trim off the length of the nail extensions, keeping the length of your natural nails if desired. File the surface of the nails to remove the shine. 

OPTIONAL:

For a shorter soak-off time, file further to remove most of the gel polish. 

Apply cuticle oil around the cuticles and skin to prevent the skin from drying out from the gel polish remover. Alternatively, you could also use Vaseline. This step is optional highly recommended.

Cut your aluminium foil into squares (approx. 8cm x 8cm).

Soak 3-4 cotton balls with a generous amount of acetone or gel polish remover.

Peel off portions of the soaked cotton, enough to cover the surface of your nail, and place over the nail.

Wrap tightly with aluminium foil, and allow to soak for 15-20 minutes.

After soaking, gently scrape off the gel polish. It should come off quite easily without too much pressure. For any stubborn bits, soak for a bit longer until it can be easily removed. After, fuff the nail plate with the buffer block.

Wash your hands. Apply cuticle oil after reapplying gel extensions or polish.