Can I swap my automatic transmission to a Manual Transmission on my 2013 Honda Accord?

How much would it cost? What do I need?

Doing such a conversion would be extremely expensive and labor intensive. You would be looking at spending $5k or more to do so. I would be much easier to trade for a vehicle with a manual transmission.

That would be a very major job.
What you need is to trade in the car for a Manual one, yes you will lose some money but nowhere near as much as trying to do that conversion

Your looking at THOUSANDS to do this. You can if you Really want but be prepared for about 4-6k to even think about it