Very much a DIY project..
Basically, remove the distributor cap, a few more screws inside and
the module and coil will come out.. just as easy to replace.
for more info, look here..
http://home.golden.net/~trinity/Probe/dist/dist.htm
although it's for the V6, it should be very close to the I4

Thanks to Mike for this page.

John

--- In mazda626uk@..., "Xavier Goh SH"
<xaviergsh@t...> wrote:
> how difficult to replace it? diy possible?