Step 1: Minimize the obvious
Begin by removing the most obvious items that don't belong. In your office space, look for things like bulky, seldom-used office equipment, dead plants, or boxes of old files that should be archived, stored or thrown away. People frequently cart unopened boxes of files from their last job to a new office. If you think you will ever reference those old memos, letters or pleadings, put them on a thumb drive and then toss the paper. Practice the 80/20 rule, which says that 80 percent of your results come from 20 percent of your effort. Recognizing this principle, keep those "20 percent" activities/clients within easy reach and file the "80 percent" elsewhere.
Step 2: Plan before you touch
One of the biggest mistakes people tend to make in an organizing project is to jump in and start examining the contents of all their files or drawers. Instead, create a plan with an end result. Incorporate your existing office case management/document management system into your plan. There will be categories that fall outside the existing office management system (think: CLE, pro bono, law office administration.) Develop a system of categorization for those items too. Use five to seven primary categories, not more, not less.
Step 3: Label the boundaries
Once you create the primary categories referenced above, apply them to everything: physical files, digital files, flash drives, bookmarks and sometimes even email. No matter the device, the structure should be the same on your laptop as your tablet. This is how you build no-brainer systems. No one likes to file, so make it easy.