Never done a Mazda,last was a Vauxhall astra diesel and before that a Citroen.
Usually support front end on axle stands,
remove front offside wheel and any inner wing plastic sheilds,
some cambelt covers split so not to remove the crankshaft pulley,
any auxillery belts should be tippex in rotation direction,
rotate the engine until all timing marks on the toothed sprockets (like centre punch) line up with marks on the engine casing,(you may have to rotate more than once)
You can tippex these marks as well (chalk not really),
the crankshaft may be locked usually access into the flywheel,
you could check the belt tension before releasing the tensioner,
the tensioner (bearings) may need replacing or the water pump (sign of weeping) at this time but the car is 20 years old.
new belt tension should not be tight,
on the longest run i check that i can twist/turn the belt and see the full face of the teeth,