I think that's why It's so important to start lean. When you do get a little bit of water weight it doesn't look bad. It just fills you out more. All of your posts have motivated me to get my ass lean before I jump onto anything heavy.
Pretty important point actually. Estrogen is synthesized in fatty tissues, thus the leaner you are the less estrogen you will naturally produce.
HOWEVER, it is your liver which produces aromatase and this in turn produces estrogen. Circulating amounts of aromatase will create problems for you if you take aromatizing compounds and are prone to gyno, lean or not. Thus an AI (preferably suicide AI) will be needed to prevent or treat gyno, regardless of bodyfat levels.
GH15 is right that masteron may be "all you need" depending on a few factors.
Since it is usually used pre-contest, it's assumed you will be on very low levels of test and thus a strong AI is probably not needed.
He has NEVER said masteron will be enough if running a heavy cycle, and I challenge him to say it would be enough to keep estrogen low taking say a gram of test and 400mgs weekly of deca as a bulker.
As always gh15 spouts random shit as fact but never bothers telling the whole story. It's either laziness or he just doesn't know, but either way there are times when masteron would be enough and times when you need more. Treating existing gyno, letrozole and nolvadex followed by 12.5mgs aromasin ed, 25 if running a gram of test a week or more, will work for most people.
If you don't have issues with gyno, don't take an AI unless needed. Keep nolvadex handy in case you need emergency treatment and run short esters in order to more easily control blood levels and mitigate unwanted side effects.
Pretty simple really, but there is no catch all "just do this 100% of the time and it's true because i say so" unfortunately.