I had that problem too, but solved it differently. Before you do this, take the computer off the internet temporarily. If you use braille and are the only one around to do so, it'll be relatively safe to write the information down and save it in a couple different places. I have the type of distro and kernel version as a header line; and then have a line with r: followed by a password and another line with u: followed by a user password. You just need to remember your user name that way. Along with that I have the date last changed. That way you can monitor for how long any given password stays in use. Once the computer is off the net, as root do a command like passwd username where username is the name of your user account. On debian anyway I don't even get asked for the old password just to type a new password and to confirm it. The whole job is done provided you don't loose your password log and put that in a safe enough place. You might also want to download makepass and use that to generate some strong passwords for you if you run out of ideas.
