If you don’t feel like wasting time and nerves, you can always apply for help from the third party services. There are tons of them online and all of them (and reviews on them as well!) are easily googleable.
You should also know that most of these services have free trials, and if you need to copy and paste the subs once, you might actually not need to pay money for that — it is quite possible that you will be able to find a suitable free trial for your needs.
However, all of these services still have various options to offer, so check them out attentively and choose the ones that you need for the efficient profile development.
Plus, if you’re trying to “steal” some subs for yourself, you should remember that there is a chance to buy Twitter followers and get them quickly, with no fuss around it and exactly in time. You should check one thing: whether those are real people or not.
If the promo company offers bots, don’t agree with it and look for another resource to purchase subs from. You need real people only, as they can show positive influence on your profile’s statistics.
Don’t forget to keep your audience (existing and newly attained one) engaged into your profile’s life and interact with them always, as often as there is a reason to do so.
FAQ
Unfortunately, you can only copy the names of followers if you open up the tab “followers” on somebody else’s page. If you need more data (URLs, etc) you should turn to third party services.
Sadly enough, today Twitter allows you to save only your own subscriptions in an archive with tweets and replies for free. If you want to download a list of your subs, you’d have to turn to third party paid services.