Wooo! I finally got my binder, its a Tri top chest binder from Underworks and I love it so much

It works great

I just have a question or two because I really dont know what Im doing
How are you actually supposed to put it on? Does stepping into it, or pulling it over your head give you a better affect? My hips arent really that big, and I didnt think my shoulders were that broad, put I tried to pull it over my head and it was so hard
And also I like wearing those tank top things but I hate having that cleavage line or whatever its called, that your boobs make when pushed together

If I push everything outwards it seems to bunch up under my arms and you can really see it with a tank top

How can I fix that problem? Does it have something to do with the way im putting the binder on? Thanks!