Excel Junkie

Hello, I am a self-taught excel junkie and I am always looking for better more efficient ways to use excel, specifically to automate more of my daily job tasks. I have been asked by my team to make these excel workbooks to help calculate items automatically for budgets, demand forcasts and actual hours. The problem i continue to run into is that the people that i make these for are not very savvy in Excel so then i have to ensure that it is "dummed" down enought in the end that they can still handle the input without making errors to the formulas (i lock them whenever possible). would love any ideas for how to make my documents even more user friendly!