I'm afraid I'm not familair with Timidity, and I'm not getting much from the links you provided. However, I can suggest an alternative that's likely easier to use.
Go to
http://www.un4seen.com/ and download "XMPlay". This is a very small multiformat media player. Extract all of the files ibn the XMPlay zip to a new folder. Then download the "MIDI Input Plugin" further down the page. Put the files from this ZIP into the same folder you put te earlier XMPLay files in.
Now you can start up XMPlay.exe. Click on the wrench icon to bring up the configuration window, click on Plugins>Input, then highlight the "MIDI (rev. 9)" entry and click the "Config" button. From here you can choose what Soundfonts XMPlay will use to play MIDI files. You can get really complex with it, assigning specific soundfonts to specific instruments, but in general just click the "Add" button, browse to your Soundfont file (Fluid 3 or any other Soundfont should work), and click "Open". It should now appear on the upper list, and the lower list should fill with lots of instrument names. Click "Apply", then close the configuration window. If you ever want to switch to a different Soundfont, just go back to the MIDI config window, select the Soundfont from teh uppe rlist, click the "Remove" button, then click the "Add" button and choose another Soundfont.
From there, you can just click the Open File button (looks like an upward pointing triangle, at the bottom of the main window), browse to your MIDI file and click "Open". It should start playing.
Hope that helps you out!
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