If you would like to write a personal letter to announce your engagement, here is a simple template you can use to write a letter to announce your engagement.
Congratulations! I heard you finally got engaged. I used to think you weren’t ready for the next chapter in life but now you definitely are. I can’t wait to attend your wedding. If you want me to have a role in your wedding, I will be more than happy to accept it.
As a witness to the trials and tribulations of your relationship, I’m happy you made it this far. If you need any help with organizing the wedding, I’m just one phone call anyway. You can count me in as one of the people who will help organize it. Besides, I am aware that organizing one is no joke. Yes, it is as hard as it looks.