I'm still learning myself, but if possible find a way to communicate between each other to ease the switches, try and make agreements and the such like. obviously it doesn't always work though

Can't stand it. I'm always fighting the change I just have a bad one in me and I don't like it none of us do

Oh my advice is to let it wash over you like waves on the beach. I find meditation helps me out with it. And if you want there's an app called relief that has ambient sounds to meditate on. 🙏🙏

Switching out, especially with one individual alter repeatedly, eventually becomes easier. Not always, sometimes it's sudden, like if it's a triggered switch. But if you guys are doing it to let someone else out in the body so they can have some time in the front, then I would say repetitive practice.

Use positive triggers like music, food, or shows the person you're switching into likes, indulge what they say they need. Then try to let it just wash over you. Keep on mind tho not everyone is the most comfy when switching and it can be more difficult for certain alters. Many of my established littles comen in by surprise or even feel good to switch into, like getting a warm hug. Some of my alters kind of posses the body, like pause in task, eyes roll back a second, maybe a little shiver, then entire demeanor shift into whoever's switched in. It doesn't necessarily hurt but it also doesnt feel great. I also have a damaged alter that tries to front repeatedly for something but he makes us really sick coming in and, especially recently, causes us to have seizures even he stays too long. We just had to convince him to only front when it involves fixing his issues or he'd hurt us too much.