That will depend on your Mechanical Ability.Unless you have a Drive On Rack, you will have to lay Down for most of the Repair.
.2L and 2.5L Engines
See Figures 2, 3, 4, 5, 6 and 7
Fig. 2: Loosen the radiator draincock ...
Fig. 3: ... and drain the coolant into a suitable container
Fig. 4: Loosen and remove the thermostat housing retainer bolts
Fig. 5: Detach the housing to reveal the thermostat and gasket
Fig. 6: Remove the thermostat and gasket assembly
Fig. 7: Loosen the bleeder screw on top of the radiator to bleed air from the cooling system
Drain the cooling system into a suitable container.
Remove the thermostat case cover located in the lower portion of the water pump. Remove the thermostat retainer bolts.
Remove the housing, thermostat and the gasket. Note the placement and direction of the thermostat for ease of installation.
For turbocharged models, install the thermostat with the jiggle valve at the 12 o'clock position.
For non-turbo models, install the thermostat with the jiggle valve facing down.
Install the housing with a new gasket, and tighten the bolts to 52-61 inch lbs. (6-7 Nm).
Fill and bleed the cooling system.
Check the system for coolant leaks.