England's run to the last four, where they will face Croatia, has come as a huge surprise given Southgate's relative lack of experience in management and the fact the team lost to Iceland in the last 16 of EURO 2016.
So get your kippers and slippers prepped, do your morning (or evening) calisthenics now, and for heaven sakes ring Mum, otherwise you just know she'll ring you during the match.
Fans had stopped dreaming about reaching a World Cup semi-final, but that knife-edge moment of desolation or delirium is here.
The game is England's first World Cup semi-final since the penalty shoot-out heartbreak against the then West Germany in 1990 in Italy.
"They're already heroes, its just about whether they turn into legends", said 32-year-old Dan Woodbury as he waited for the 1800 GMT kick-off in The George pub at London Bridge.
Gareth Southgate's Three Lions meet Croatia at Luzhniki Stadium for the right to take on France in the final, after their 1-0 victory over Belgium on Tuesday. We are really pleased with his contribution.
"For us as a team, yes, it's another chance to create a small piece of history".
"The improvement and the hunger in the players is very clear for everyone to see".
"Southgate wants his players and his team to be themselves and to be together".
"We keep looking to break the barriers down".
"When England played Colombia we noticed traffic levels drop by about a third so we're anticipating similar on Wednesday", said Frank Bird, an emergency planning officer at Highways England.
"I've been jokingly saying that football's coming home, but now there's no reason why we can't win it". "His team-mates play at top clubs, it's going to be a hard task but if we're ready to give our all on the pitch like against Argentina, if we're compact, I don't believe there will be problems".
England's dream that "it's coming home" continues, with Dele Alli scoring a second-half victor. "It has a slightly different feel for me, but it's nice to hear people enjoying it again".