Often writing for yourself (“how I did x when I didn’t know how”) is useful enough without being an expert on the subject. You can refer back to it later on if

Often writing for yourself (“how I did x when I didn’t know how”) is useful enough without being an expert on the subject. You can refer back to it later on if you forgot how you did it, or someone else who was in your shoes will appreciate it. Also makes things less daunting (“hey others are going through the same as me”).