I can speak out of experience on this. Hard truth, it'll be hard regardless what you do on those who care for you, even those you think don't care. I guess it really depends on how much you really care about the other people in your life
If you cut people out, you will leave them wondering what more they could have done to help you. If you don't they will wonder why you did it when you had them in your lives. Either way the outcome is more of less the same, questioning why and what more they could have done. Leaving a note can help people understand your reasons but can also leave people questioning more.
My wife took her own life a month ago and I have had countless messages from her friends, sad that they didn't reach out more and feeling guilty about it, ultimately it wouldn't have made a difference. I did all I could but couldn't save her and still left questioning why I wasn't enough (despite coming to terms that this was her choice and knowing I couldn't have done more).
It changed my life irrevocably and broke me beyond repair leaving me without a future or world I can live in. I know first hand the grief that her suicide has had on so many people - myself, her family, my family, our friends, her friends, my friends, work colleagues even the postman. That said knowing the grief I will cause would not be enough to stop me.
Ultimately I think it's best not to cut people out, let the people in your life who care for you care for you to the end.
Also, I would implore you not to let anyone who deeply care for you find your body that makes an already hard situation unbearable.
wishing you peace