A licenced engineer gains his licence by obtaining the required licence module examinations for his chosen path, backed up (more importantly) by recording practical tasks (authenticated by the licenced engineer certifying them) that his national regulatory authority require and a minimum timespan of experience within a PART 145 maintenance enviroment (also authenticated). The CAA is one of the tightest on the requirements in EASA on practical experience. This is not including the type rating requirements and the company approval that is required to be authorised to sign off CRS's on commerical air transport aircraft.
A B1 or B2 doesn't walk straight into the industry. He will go through lower levels first of all. In your case, you will have to either:
Do five years as a maintenance worker/mechanic at a line station/base maintenance facility if you do the modules as a self improver route.
Do two years minimum if you have done a recognised PART 147 course of instruction (usually the foundation degree course like Kingston Uni, LRTT, AST Perth etc) that includes practical training and the module exams
or another industry field that is acceptable to the CAA
Do one year minimum if you have serve a required time on military aircraft maintenance (although you will have to supply authenticated documentation of this)
In a line station, the B1 or B2 Tech will be responsible for overhaul certifying release of maintenance on an aircraft (to his particular boundary), however he will have "A" licenced certifying mechanics (who can self sign off tasks that are limited in scope and he is authorised to do so) and mechanics / maintenance workers who do required tasks at the request of the Tech.
In a base MRO, the B1 and B2 are support certifying staff, who will run various zones of the aircraft (with supporting mechanics / maintenance workers / cleaners etc) and sign off the relevent workpack tasks as they are completed. However the main CRS for the maintenance pack and the tech log entry CRS for the maintenance check will be signed off by a "C" licenced engineer (who runs the show for that check). The "C" Engineer is a suitably trained and experienced "B" engineer, who has fulfiled the requirements of the CAA and his company..
There is a heirarchy, same as any workplace.