Can any Londoners help me navigate the tube?

[Namechangedfortubehelp]

Hi all, proper country pumpkin here in need of some help navigating the tube

I need to get to southfields tube station. From kings cross. I believe it's the district line. I've tried to google and one site says go via Victoria and another says via Earl's court. Can anyone also advise how long it might take? The sites I'm using vary from 30mins to 90mins

Also if anyone knows how I could get to southfields from Heathrow that would also be helpful

Huge thanks in advance

I'd always go Kings X to Victoria rather than Earls Court - it's much quicker and all the District Line trains leave from same platform whereas at EC you can end up scuttling from one side to the other . It's honestly not a difficult journey, tubehelp, and if you feel lost, ask someone, don't believe the hype, we're generally quite friendly and helpful.

Thank you again everyone

Pick up a leaflet with the map on it and pay attention to the signs on the walls. When you get on, look up, most tubes have their route printed above the seats. If you're on the wrong train dont panic. You cant get lost, just get off at the next stop, cross to the opposite side of the platform and go back in the other direction.