What after buying an IG account with large following?

Hey guys,

I am about to buy a couple of established Instagram accounts with a 5 to 6-digit following.

These won’t be used as a part of a network. Both accounts will be rebranded for specific individuals (fashion and lifestyle influencer types). But I have concerns and questions. Hope you guys can help!

1.) How would I go about accessing the account and using it in regular ways (not using Jarvee or any other tools)? With tools or even a browser, I know I can use residential or mobile proxies in the same country as the accounts’ current owners. But the goal is for my influencers to be able to use the accounts normally on their phones. So how would I go about this, without having to use proxies for in a long term?

2.) I reckon I shouldn’t change the account username and names outright, and warm up the account by posting videos/reels/images of the influencers who will be using the accounts, mix in with some other usual materials relevant to the accounts. And after say… 1-2 months, change the username and name, and delete the old irrelevant uploads. Is it the right approach?

Also if you guys have any other dos and donts with purchased IG accounts, I’d much appreciate it!

Thanks a bunch, fam!

– Demon