Root Newbie needs to switch ROM, what do I need to do?

[mcnob]

Tried a bit of a buggy ROM and not happy with the outcome. Now, I followed the very helpful guide for one-click rooting to add the new ROM but I wanna switch to the LeeDroid 1.4 release now so what do I need to do?

I'm thinking a complete wipe would probably be best so gonna format my backed-up SD card as well and partition it for a2sd+ but can anyone just run me quickly through what I need to do with ClockworkMod etc. to scrub off the old ROM and install the new one pretty please?

Thanks a lot.

 

[mcnob]

I should maybe mention it's an unlocked and sim-free Desire.

 

[Tunga]

Copy the ROM to your SD card, boot into Recovery, and select "Install ROM from SD card".

Back everything up first with Nandroid/Titanium.