There comes a time when a woman, regardless of age, is assigned to do the invitation. No matter how simple and trivial it may seem, we all seemed to panic at the thought. What do we do? Who do we ask? Where should we print? What paper to use? What are we going to write?
As much as there are templates of several invitation samples out there, not all were appropriate. Not all were what you would like it to look.
If you are like me, kind of OCD, nothing is ever good enough for me. And sadly, the more revision I make, the more expensive it becomes. So unless you are good in graphics designing, there's really not much you can do but go for the cheapest and simplest design.
You can however, look for something alternative. You can still put your input on it, but still make it look professional... and most of it are free.