Do some research into epi rebound and nolva rebound. It happens more than people think. Like I said it happened to both of my mates. Also that a lot of compounds to be on at same time. Just running msten at a calorie surplus of a 500cals....(extra calories should come from protein only. Takes a lot of extra protein to gain 1 pound of muscle. Your body just didn't magically make 10 pounds of muscle in a few weeks cycle)....will get you 10 pounds+. The epi would give you up to 10 pounds. And the tren could give anywhere from 8-15lbs.
Running this stack could potentially ruin your future gains also. For example if decided to run msten solo later on after this cycle you'd have to run very high doses to see anything. There's a specific name for this when it happens but can't think of the term. It's when your receptors are no longer as responsive or something. Something else for me to research.
I'd get bloods done every week also to watch your liver values. 2 methyls together is a lot of stress. watch for grey coloured stools (poo), whites of your eyes going slightly creamy possibly yellow, feeling sick, lack of appetite and pain from stomach area are signs of liver stress, possibly severe to the point where you have liver failure. Side effect of that is feeling like death and then death follows if nothing is done.
NOT TRYING TO SCARE YOU. This is serious stuff and you need to be prepared and never think "this won't happen to me". The moment you do that you've become complacent.
Old mate put it well before saying expect the best prepare for the worst.