Time frame - a day, you might as well replace the cam belt, tensioner & thermostat too seeing as you're in that area.
disconnect batt
drain coolant
remove s plugs - makes turning the engine over easier
jack up, support and remove driver's F wheel and inner splash guard
remove alt / AC belt & PaS belt
Jack under sump - gently take weight of engine on jack
remove hydrolastic engine mount connections [you don't have to take the actual mount out]
top engine tie bar loosen and swing up out of way.
underneath, remove lower engine tie bar thingy
remove top cam belt cover
turn motor on the crank pulley bolt so its 90º BTDC
place cam pulley locking device between cam pulleys
remove crank pulley
remove lower cam belt cover - nearly there!
loosen cam belt tensioner
remove [and disgard] belt [ unless it's very new]
remove water pump!
While your there: check cam shaft oil seals for leakage!
Did I forget anything?
re-asseembly
replace thermostat and its 'O' rings [if it has the std thermostat]
RTV seal w'pump 'O' ring into its groove - fit and torque up 9ft lbs?
Replace cam belt tensioner and its bolt
fit new cam belt - from cam belt drive up, over cam pulleys, down to tensioner and w'pump... set tension...
take care fitting the new belt, take care that cam pulley timing marks line up when turning motor over by hand 2 or 3 times. carefully refill with quality coolant and deionised water / rainwater... bleed cooling system
All good fun on a nice summer's day
