1. Gather everything you will need. Depending on what style of catheter you use, your supplies could include a water-soluble lubricant, sanitary towelettes, drainage bag, etc. 
2. Sanitize! This is an incredibly important step to reduce the risk of infection. Make sure to wash your hands with soap and sterile water. No sink nearby? No problem! A sanitary wipe or towelette can also do the trick. 
3. Check your catheter. Get into the habit of looking at your catheters before insertion, to make sure the product is still securely in the packaging and not damaged or the incorrect type. 
4. To prepare for self-cathing, sit comfortably on the toilet with your thighs spread apart, or in a chair across from the toilet. Clean yourself by spreading your labia apart (the folds at the opening of the vagina) and use a sanitary wipe to clean in between them. This helps eliminate any bacteria that may be present. If you are not using a pre-lubricated catheter, apply the lubricant 2-4 inches down the catheter tube. Sometimes it can be difficult to find the opening to the female urethra, so it can be helpful to use a mirror or your finger to find the urinary tract opening. Slowly begin to insert the catheter into the urethra until urine begins to flow freely. While it is normal to experience slight discomfort, any pain should alert you to contact your healthcare professional immediately.
5. Once you’ve finished insertion, allow your bladder to empty completely. Once the urine stops flowing, slowly and gently pull the catheter out of the urethra. To finish, discard your used catheter and supplies in the trash bin and clean up by washing your hands or using a sanitary hand towelette. 

Make sure to always consult your healthcare professionals with any questions or concerns you may have.