1995 Questions for all other cars Rover 400 1.6i 16v

Engine problem
1995 Questions for all other cars 4 cyl Wheel Drive Type unknown Manual 74000 miles
Rover 400 1.6i 16v
I am changing my head gasket, before taking the cam belt off I need to secure the two camshaft sprockets together so they dont move during the removel of the cyl/head, I did'nt have the correct tool so I used plastic ties this did the job so I thought until I removed the belt and the cyl/head, thats when the sprockets span round! Nocking the timeing out of sequence.

My Qustion is: when refitting the head is it just a case of alligning the lower camshaft sprocket timing to top dead centre (TDC) and then positioning the top two sprockets(exhaurst and inlet) to there correct postion before refitting the cyl/head + cambelt? Please help!