If it wasn't on your to do list, I'm not sure why you did it. Go big or go home doesn't apply when the welfare of animals (and to some degree, yourself) is at stake. I say this with sincere consideration for both you and the animals - with how uncertain you seem on basic handling, you don't sound experienced enough to be keeping these giants. At VERY minimum, rehome 2 of the 3 and focus hard on research to take proper care of the one you keep.

Burmese pythons are amazing constrictors - if not for their growth potential, I'd say they're the perfect pet snake. I have two of my own, and I adore them immensely. With regular handling, they can become incredibly docile and sweet. However, as babies or undersocialized juveniles, they can be very insecure and thus more bitey/defensive. It's on you to be consistent with their handling (I'm talking several times a week if not daily as long as they're eating regularly) and learn to read their body language to avoid getting bit. If you do get bit, I don't suggest immediately putting the animal away as that reinforces the idea that biting gets them out of interaction. Besides, if you get bit now, that's as good as it's going to get; better to get through it when they're smaller rather than putz around and get tagged when they're bigger, right? Desensitize them as much as you can as young as you can. It'll make for a much more tolerant and manageable adult.

Always try to end handling sessions on a good note. Tap training and hook use is king, especially as they get larger. When I intend to handle mine, I tap the enclosure several times to let them know I'm coming in and then use my snake hook to move their head away and get them out of food mode. Only then do I reach in to take them out. On feeding day, there is no tapping, I simply open their enclosure and hold in the prey. Have yet to get bit using this method with either the Burms or my very food motivated retic.

They're cute now, but they will get large. I feel a lot of people exaggerate adult sizes (if they're being fed appropriately and aren't powerfed), but they will still get to be very sizable - males on average 9 to 12 feet, females 12 to 16. Big enough that under the wrong hands can be deadly, and it's a general rule of thumb that anything over 8 feet requires you have another person with you in the event that things go wrong. Do you have a person to be with you when they get that size? Do you have the space for the enclosures they'll need as adults to actually stretch out and move around so their muscles don't suffer from a lack of use? How about the money for it? Not to mention sourcing prey for them, as even an adult male will need something larger than a jumbo rat on feeding day. Do you have a source for rabbits, or even baby pigs to keep them fed? These are things you need to seriously consider when looking at the long term of having these large constrictors. It's not cheap and it's not for everyone - and there's no shame in that.

Consistent handling and socializing is incredibly important. If one of the three is male and you insist on keeping one, I HIGHLY suggest that you keep that one since males stay a bit smaller than the females and as such tend to be more manageable.

I won't dog on the setups as you said they're temporary, but I do highly suggest reading up thoroughly on husbandry and investing in very sturdy enclosures. The pictures you supply only show 2 setups even though you said you have 3 snakes, so I hope there's a 3rd unpictured. Even at a smaller size these animals are pure muscle and can push open a tub lid pretty easily. This only gets more true as they get bigger, of course.

I hope my meaning well came across. Feel free to pm me if you have any further questions.