Thanks for the compliment
Unfortunately it sounds like you have the wrong type of switches
Switches come in many different types...
The first thing
you need to consider is how the switch is activated, for instance you can have: slide, toggle, rocker, momentary, push button etc. These terms tell you how you will physically use the switch. The switches used in the guide are 'slide switches' because you slide the small plastic part that sticks out, however most people (Including me) prefer 'toggle switches' because the are easier to fit to the consoles casing and make a neat looking job. Take a look at this picture for examples of different types of switches:-http://en.wikipedia.org/wiki/File:Switches-electrical.agr.jpg
The second thing
you need to consider is how the switch contacts are arranged. For instance a 'simple' switch is called SPST which is short for 'Single Pole Single Throw'. This type of switch only has two contacts, so if you have two wires connected it would either make a connection between them, or break the connection - in other words its just 'on' or 'off' just like a light switch. Its this type of switch which you probably bought.
However that is not the only type, next up would be SPDT or 'Single Pole Double Throw', this type of switch has three contacts and whichever wire you connect to the middle contact can be 'swapped' between the signals on the two end contacts - its this type of switch you want for this mod. You connect the middle contact to the PPU or CIC leg, and the end contacts to +5V or Ground so that you can switch between the two. If you take a look here and scroll down slightly:-http://en.wikipedia.org/wiki/Switch#Contact_terminology
You will see lots of little diagrams which show how different types of switches work.
In the guide mmmonkey used a DPDT which has six contacts, but this is not necessary for this mod. mmmonkey says at the start of the guide "As usual mmmonkey has chosen small sliding switches, and can only get hold of double pole switches (that's with 2 rows of contacts to solder onto, only solder onto one of the rows)". A SPDT switch has one row of three contacts as standard.
The third thing
you need to consider is how the switch mechanism is configured - this can get quite confusing, but a SPDT switch is available in ON-ON or ON-OFF-ON configurations. An ON-ON switch only has two actuator positions (An actuator is the part of the switch you move with your fingers) with both making a connection. An ON-OFF-ON switch adds an extra middle position that disables all connections, so if you moved the actuator on an ON-OFF-ON switch you could move it to one side, then to the middle, then to the other side. For this mod you need an ON-ON switch.
So simply put, you need 2x SPDT toggle switches in an ON-ON configuration, just search on eBay for "SPDT toggle switch ON-ON" and choose your favourite type, I recommend 'mini' or 'miniature' toggle switches since they are smaller then full size ones and will be less obvious when fitted.
I dont mean any offence, but if your really interested in getting into modding then there are loads of beginners guides available online than can help explain electronics terms even better than me, and will help you get a good understanding of how things work. Simply put in google "beginners guide to electronics" to find loads of great guides - if one is too confusing just find another one until it starts to make sense. Here is quite a good site:-http://www.kpsec.freeuk.com/components/switch.htm
That tells you all about different switches (For this mod you dont really need to worry about ratings) and if you look along the top it has links that go into detail about all sorts of electronic parts.