There are many ways to create sigils, but I'd like to share my method, which is fairly simple, and makes crafting sigils less intimidating than some other methods make them appear.
First- Create Your Sigil:
Step 1: Write your word or phrase in the present tense. Remember to be as specific as possible. Example: I am protected from all negative energy.
Step 2: Cross out vowels & repeating letters. There is no right or wrong way to do this. Sometimes I will delete the extra letter/s, and sometimes I delete the repeated letter entirely. Examples: 'I am protected from all negative energy' becomes MPRTCFLNGVNY or PRCDFGVY.
Step 3: Assign each letter a number with the following chart:
1 2 3 4 5 6 7 8 9
A B C D E F G H I
J K L M N O P Q R
S T U V W X Y Z
Examples: MPRTCFLNGVNY turns into 479236357457 or PRCDFGVY turns into 79346747
Step 4: Next, create a 3 X 3 box of 9 squares and randomly add numbers 1-9 in the spaces. It should look something like this:
1 6 2
7 5 9
4 8 3
Step 5: Use the box to draw a line through each of the numbers of your phrase/word (79346747), going in order from the first number to the last one.
You can be creative in how you want to draw the lines. They don't have to be straight. Sometimes I will do curves or curlicues to create something unique. Get as creative as you wish.
Step 6: Now you can dress your symbol up with dots or accentuating lines. I love constellations, so I tend to add dots to the points of my sigils to make them look like constellations in the sky.
Second- Activate Your Sigil:
To activate your sigil after creating it, you must destroy it. You can, of course, copy it into your grimoire to save it and then create an additional copy to destroy to activate it. Here are methods I use depending on where I am and the circumstances: