hello there , i have just picked up my free 126 fsm

... and on inspection of the birds nest in the engine bay and the lack of engine i have decided to put my doner engine in it ,
is it hard to remove the old one, and can i do a straight swap ?? they are both 650 cc and all i need off the doner engine is the starter motor and distributer and carb .....
i have a haynes manual but just wanted to know if a pratical unexperienced person like myself could tackle such a task and what do i need? tools? jack

and how do i remove the partial old one?
i have pictures of the car if anyone wants them .
please get in touch
all the best
richard