Lead with what ? As in what action ?
Tehran is about 700 miles from Qatar, the general area where there are US bases. And there is a sea between the Gulf states and Iran. There is Iraq to the East of course, an attack could be launched from there. North is the Caspian, Turkmenistan. East is Afghanistan and Pakistan.
The photo below shows Tehran. It's a mountainous country, more like Afghanistan than the flat open desert of Iraq. Iraq to Tehran is 430 miles.
It would take a massive invasion force. And Iran has almost a million troops. So it would be like doing a combined Iraq and Afghanistan invasion at the same time. More so in fact, because unlike Afghanistan, Iran has not had decades of civil war that has weakened it. It has been preparing for decades, not fighting.
I totally agree the regime needs removed. And as you say the regime is very powerful.
Military action would need a massive force.
I really do not see what a few bombs or missiles will do. Trump bombed Nigeria recently. What has that done. ISIS in Syria has been getting bombed for over a decade, and there has been a land war too. ISIS are still there.