The covert lifestyle can be mentally taxing, and you will make mistakes (if you're not consistently careful).Catch the flu or a cold, get shorted on sleep for one or more nights or have one distracted moment for any random reason and that can make the whole thing fall apart. People seem to vastly underestimate this reality.
Also: In practice, people who are in earnest on the run are often identified based on things like subscribing to their favorite magazines related to their hobby.
I think for most people that's the harder thing to address: How do you just stop being yourself and develop entirely new interests?
Trying to just not do X because it's closely associated with who you are is amazingly hard and can rapidly start making people actually crazy. This is much harder to do than breaking a bad habit which is infamously hard for most people under the best of circumstances.