My daughter has pots. Has had it for about 15 years (she's 29 now). The main thing is that she has to be careful when getting up from any seated or lying position. Pretty much any time she sits up or stands up. When she gets out of bed in the morning she has to get up slowly and sit for a few minutes. Then she can get out of bed. Getting up from a seated position is easier. She just needs to do it a bit slower than normal and make sure there's something to hold on to.
POTS can seem scary but it's manageable.