If I had a hammer

The use of a hammer and a nail is a two hand operation.  You can't build a work bench without  a lot of nails.  So if you can't use both hands the next best thing is a pneumatic nailer.

Being retired and on a fixed income, I shop at Harbor Freight Tools often.  I got this nailer on sale for about sixty bucks.  It works great, I have ran over 500 nails through it with no problems.  Harbor Freight has a 90 day store return policy.  However, if the tool has moving parts like a nailer I highly suggest buying a one year return policy.