I would take things at a gentle pace, and just do a little bit each day ... and split the training into three streams:-
1) Hospital Organization
2) Anatomy and Physiology
3) Biomed Techniques
For example:-
1) How the hospital is organized, what each department does, and how they inter-act (leading to priority of response by the biomed). "The Hospital as a System"!
2) Start with the heart ... and take it from there (paying special attention to signal "shapes" and voltage levels). "The Body as a System" - and relate physiology to "engineering" (the heart as a pump, for instance); analogies to "plumbing", and equivalent circuits!
3) Electrical safety in the hospital ... then on to what each bit of kit does, and how it works (ECG, ESU, X-ray
etc., etc.). Basic principles and block diagrams!
Then simply deal with other stuff as it arises; oxygen cells, medical gases, laboratory instruments, biomed test kit ... and all the rest.
Other than that, the Buddy-Buddy system of learning on the job ("learning the ropes", gaining confidence, whatever) by going around with an experienced tech for a while is probably the best way of all, in my experience. "Mentoring", in other words.
