Anybody without experience, should not install alone....but its the same advice, you would give to inexperienced electricians or plumbers.
Everybody has to start somewhere in a career, but in the fire industry, the are no real college courses to gain a C&Q or NVQ. Yet there is is 8 part British & EN standard on the subject. So an FIA or BSI course is really all that is on offer, and expect the students to already be existing qualified sparks. Best advice I can really give is team up with a good local alarm company, and offer to install along side there design. You gain experience installing, and get paid for it, the alarm company conduct the design and commission side.