Slug change over drills can seem somewhat elaborate depending on your weapon, and some may question why it is needed to begin with. If you do not believe in the need for a slug change over, it is unlikely you would ever master the technique. It is not typically something you do as a hunter, but would perform during the defense of your family and property.
This is updated instruction about Remington 870 safety button replacement. It is more detailed and also has better photos.
When you want to replace the safety button of your Remington 870 you will want to install an oversized safety button. This will allow you to disengage the button more easily, especially if you are wearing gloves or are in a stressful situation where you may lack focus and concentration.
This is updated instruction about Remington 870 forend removal/installation. You will see more detailed step by step instruction and photos in better quality.
First of all, make sure that your shotgun is unloaded. Check both magazine tube and chamber, check visually and by touch.