I own four. My first was bought as an adult. She is currently just over 5.5 feet and weighs just over 30 pounds. She is vocal and will hiss often but has never made a defensive posture or tried to strike. She is puppy dog tame and will lay on the couch with you all day. While she has never tried to tag me she can get stubborn at times. For example if she doesn't want to go back in her cage she can pitch I fit. She can throw her weight around and is fast. I'm a big strong guy but when she does this I understand why big snakes should only be handled with two or three people. She is usually so slow at everything but during a fit she can really turn it up and surprise you by how fast she can be. I think she could very easily be a hand full of trouble for a smaller person and she's nice. Like with all snakes They are individuals so it is possible to get a blood that is just always in a bad mood. I feel lucky with her as she really is a joy most of the time and in my collection she is probably the most laid back.
Now my other three I bought very young. They were tagging me left and right (my profile might have bite pics). They hissed, bit, and squirmed all about when trying to deal with them. However after probably two months two started to really calm down as they figured out biting me did no go and I was not there to hurt them. My male took a bit longer to convince. Now having them almost two years I can not tell you the last time one struck. They are very vocal like my big girl but very nice to deal with. Like my big girl they are usually very easy to deal with but from time to time they will refuse to go back home easily. They are still at a size that it is no problem but they are much the same a my big one.
As long as you feel you can control a big blood and house it, mine is in a pvc cage 48*24*15, you should be fine. If you want to have a better idea of a snakes temperament get one that is a sub adult. That way you have a better idea of what your getting yourself into. If you get a young one it is very possible that it will try to tag you. They will draw blood but it really does not hurt and is over before you knew it happened. Nobody will be able to tell you exactly what your blood will do and what hi have told you is only what I have observed from my four. I have read of really nasty ones out there but that has not been my experience.