On a 16V F7P engine there aint any rockers !!
To replace the cam followers, youre gonna have to remove the top valve/cam cover, distributor; timing belt covers and timing belt; remove cam bearing housings; lift out cams; remove/replace followers (easy using a magnet); refit cams; refit cam bearing housings; refit valve cover with NEW gaskets; refit and tension NEW timing belt; refit timing belt covers.
Whilst youre there, you might as well replace the cam oil seals which requires removing the sprockets off the cams.
You cannot mix up the cams as the exhaust cam has a slot for the dizzy.
The most important things are: 1. when refitting cam housings apply sealant to the surfaces; 2. ensure your timing is correct when refitting cams/timing belt etc.; 3. ensure timing belt tension is correct.
Have fun .....