i think no one should underestimate Iran at the moment, because no one knows how much and which kinda weapons/missiles Iran currently having.. because they have support of many countries who are somehow enemies of US/UK/Israel... though Gulf is against Iran also.. but gulf doesn't matter for Qatar at moment..
Iran have supporters against US/UK/Israel. though if they attack Qatar, they will make a life time enemies in Gulf, but this the best option/nearest point they got.
here is the Gulf largest american base, plus israel is the country states are defending for last few decades. so hitting Qatar and Israel will be options for them..
Now though they will face a lot of problems and hard time against these four countries, since they are surrounded by all side, Afghanistan, Seaside, then Saudi Arabia, Israel can hit them by long distance missiles, but in response they will get also,

well I wish that they do not attack Qatar, even if its an american base..
but for Israel, i support, and wish them all best wishes..
GO IRAN GO...