I recently saw a genuinely dispiriting article celebrating a long-time local bowling alley by telling the cute anecdote of how they secretly let regulars in to bowl during lockdown, and then using it as an analogy to segue to an anecdote about the original founder doing some trivial act of transgressing corporate rules 60 years ago.
Like jesus, I know none of you fuckers care now, but the fact that we are retconning the past too? Disgusting. Our lockdown was not strict and lasted like a goddamn month or two, it wasn't a harrowing experience, and it was woefully insufficient, not some overreaction or triviality. I'd say it saved lives but because of liberal cowardice and dipshits like those business owners and their customers, it really only delayed a few deaths.
There's no 100% risk-free option. You should know the effects of estrogen and make peace with them/make a plan for what you are and aren't okay with before starting. But in my book, risk is just life. You aren't going to have boobs overnight, but breast growth, while pretty slow, will start within a couple weeks.
Make of that what you will. If it does make you happy, would it be worth growing boobs? If it doesn't, do you trust yourself to stop promptly before unwanted effects set in.
People online have tried and theorized various regimens to achieve what you describe, but nothing is anywhere near well trodden enough to be blanket-recommendable, you'd have to either work with a friendly doctor or do your own research and tread carefully with DIY if you are comfortable doing so.
Some options in that realm are explored in articles on https://transfemscience.org/articles/ (eg here and here) and probably various less reputable places online.
I tend to agree with the sentiment that if you're trying estrogen as a bit you should at least interrogate that feeling further, or just try it. It's not a very cis thought. Its not a decision anyone else can make for you though.