I’ve worked with lawyers a bit in an IT role so I’ll put it bluntly. Don’t bother.
Why? You have to ensure complete compatibility with Microsoft Office standards in your job and you may also need to access third-party systems especially document management systems on a regular basis. These things require Windows. It’s a sad fact of life that your colleagues being able to read your documents and ensure consistent layout is more important than anything else.
Yes, you can try Libre Office and soforth. However, the moment the court staff, other lawyers or anybody else gets a jumbled mess you’re going to cause yourself more problems than it’s worth. Even you yourself need to be able to ensure compatibility when it comes to information storage and retrieval too.
Windows licences are essentially free with your devices anyway and the cost of Office is a couple of hundred bucks top. Money might be tight but losing information from your court cases could put you out of business.
Sorry Linux fanboys, but Windows is the superior option here as much as I wish it was not. It’s simply the best tool for the job.