Taking the test will feel a little uncomfortable and uncommon for most people.
Stay calm and relax as you go through the process. If possible, do a mock practice without using any of the testing materials.
Refer to the following link for swab test video demonstration at https://www.youtube.com/watch?v=9WayjX6vCdk
This is for Covid-19 PCR Swab home test kits in the UK. Exact models may vary.