Using the analysis button in daily games

Using an engine during a tournament is a huge no-no; I know this. But during my regular daily games, the analysis button is sitting right there almost asking me to push it. In terms of a game in progress, what will pushing it tell me? Even though I'm desperate to know what happens if I push it, I'm worried about what will happen to the game in progress, or worse what it will tell my opponent. Does it make me a cheater? What is the etiquette/legality of this?

When viewing one of your Daily games, the Analysis button will let you move pieces on the board, record lines, and let you take notes.  It does not turn on an engine (that's why the button is available on that page).  So I highly recommend using it!

Excellent, that's a huge relief! <whew> I'm going to go try it out right now. Thank you for letting me know. 

It is perfectly legal to use that. All it does is you can make moves and test responses your opponent might make to see if your plan will work. 

I just wanted to add a word of caution, not to get too reliant on that analysis system of chess.com, some use it religiously others as a crutch, meaning if it doesn't give you a perfect 80% or something you automatically played bad.  It does not take into effect the human factor, analysis is a program made by a human(s) saying ,"this, this or this, is fine but that, oh hell no that is wrong"   If anything treat it like you would anyone offering advice, just that, it's advice you don't have to take it.  I am sure there are people who would disagree with the computer and come up with better alternatives or reasons for what they did. 

So rule of thumb, if you have a reason for a move and you can defend that, good.  In other words "If it is stupid and it works, it isn't stupid" 

If your play is unorthodox, like my Do or Die style, you and the analysis will NEVER see eye to eye.  Because it is not "Normal"  I get wins all the time, losses too however I never change my style. the 50% accuracy beating people who "play by the book."     So just be careful with that system.