I tell myself these days that legal wranglings are simply a cost of doing business, but unless you're a large org with layers to abstract you away from the lawsuit, getting sued is paralysis for startups. So if you do get sued I'd recommend you settle it if possible, be mad for a few days and then just move on.
And consequently, there is a lesson here about the incredible loss of productivity caused by patent trolls on the economy. It's a percent of GDP, if you think about it.
Now that I think about it: I currently have two items I returned, now I need to wait for getting my money back. Could that kind of thing be outsourced (agent in India who keeps nagging the companies in question?). In general, a nagging service?
If you are actually hoping to learn how to do some of the same, two good books are "Getting to Yes" and "The heart and mind of the negotiator" (or mind and heart -- I never can quite remember which). Both were required texts for a class I took on negotiation and conflict management.
There is some truth to that. I do, at times, fret too much. So there is some cost in terms of peace of mind. However, even though I cannot prove to other people that there is a cause and effect relationship (between my actions and specific outcomes) and even though the reduction in hassles cannot be quantified with exactitude, that doesn't mean I cannot quantify it sufficiently to conclude that the benefit is well worth the cost.
For example: My divorce was amicable and there were no lawyers. IIRC, the average cost of a divorce lawyer when and where I got divorced was $18,000. No, I can't know if I "would" have spent $5000 or $18,000 or $40,000. I can know that I saved thousands of dollars on lawyers fees by having an amicable divorce. I am also very certain that it benefited me by more than that: I got thousands more from my husband than I was legally entitled to. My husband was not a wealthy man. After paying lawyers, there wouldn't have been that much to fight over. (He had a job, we had a bunch of debts and some household possessions.) I have every reason to believe that the approach I took was all to the good. Can I prove that to skeptics beyond a shadow of a doubt? No. Can I measure it with a high degree of confidence for my own peace of mind? Yes.