Its a fair point about their size and strength as an adult if they decide they are going somewhere it can be challenging to persuade them otherwise
As KMG suggested if you can get your hands on a large adult so you can feel the strength and decide if you would be capable of handling it that would be good, however some people can be put off if their 1st experience is with an adult right off the bat simply due to the difference in size.
However when its your own snake you have watched grow as you have fed it and you have countless hours of handling it as it grows, you have far more confidence in yourself than you will have simply going to look at one and possibly be intimidated slightly.
Depends on you really decide if you really want one and as long as you are physically able to handle an adult, because their is no point otherwise getting a snake that will outgrow your physical capabilities as an adult.
Here are some examples of adults I have that are a decent adult size. All mine were reared from hatchling and all are hissy and puffy but fine when out. You will certainly learn to read snake behavior better with bloods simply because you have to respect them a bit more.
One make with one of my boys
Big heads shifty gaze
an idea of size against a can of beer
they do love to soak
they get thick
and if they do tag you be prepared for pain and blood ... a few years ago my mistake got me tagged lol
hope that helps
snakey