Okay, but when you show up to an ER with an IO on a patient with a central line that you could have accessed, you will lose credibility points with the staff. I don't mean that you are not in fact a great paramedic, only that you will leave a bad impression among the ER staff who have not see you working in the field.
When you have a beautiful PICC line right there in front of you--the most perfect IV line you could ask for--and just waiting to be accessed in, and instead you drill a needle into someone's bone...well, I don't know man.
Again, not beating up on you personally, just saying that experienced people in the ER are going to be scratching their heads.
Why not do the right thing and question your EMS agency's QC officers about why you have not received proper training for something that is in your protocols and that you should therefore be responsible for knowing? If you haven't received this training, then your co-workers likely have not either, so here is a perfect way to improve the professionalism of you and your co-workers.