Don't even go there, As DiRN has said the cheapest way is to sell the auto & buy a manual.
The swap is a lot more than just the transmission, it includes the full power train wiring loom, ECU, Instument cluster ext, ext , ext.
A few years back I imported a 99 Vvti Supra twin turbo that had been converted to manual in japan. It had a new Getrag 6 speed fitted but the car would not run properly as the ECU was looking for an auto. I purchsed a manual ecu. Would not fit, different plug layout.
I'll cut the story short by saying it took many months to get it right.
I bought it cheap & it was a genuine low K car, but I had to sell it cheaply as it was never going to be perfect without major expence