As a professional business analyst practitioner and trainer, I have come across many BAs who feel one must learn a special tool to develop user interfaces.
At worst, they settle down with Microsoft Visio. There is actually a secret tool that all of us already know but we do not use the power of the tool.
It is Microsoft Excel.
In fact, Microsoft Excel has many advantages over Visio. Few are:
Will be happy to learn any other best practice of using excel for developing User Interfaces.
Cheers and have a good day.