How to "downgrade" to testing?

[Jonathan Melhuish <lists@netacclaim.co.uk>]

Although Debian "unstable" has actually proved pretty stable for me, I 
am aware that it is the development version and hence I cannot moan in 
the slightest if somebody breaks something.  Upon further inspection, 
the "testing" distribution would seem a much better choice (this is a 
client machine behind a block-all firewall, so security is not a 
consideration).

Everything procedure for "downgrading" that I have found so far seems 
rather elaborate - is there really no easy way to do it?  As I say, I am 
quite happy with the stability of my system, so I would be quite happy 
to "freeze" it until newer versions make their way into the testing 
distro, if this won't cause problems.

Any advice would be most appreciated! :-)

Cheers,

Jon