Auto to manual gearbox swap

[Jimmyo06]

Hi all , just joined , question on the above , how easy is the conversion and any ideas of cost?
I am in SE London area

[cliftyhanger]

Which car/engine.
Will you DIY or pay a garage to do the work?
Do you want an overdrive gearbox (the sensible answer is yes, but OD adds a fair cost to purchase)