I think that if you're doing this much planning, then you definitely need to talk to your T about it. Maybe you could say to your T that you're safe right now, but really worried about some of the thoughts you've been having, and see where the conversation goes from there. Being worried about it is a good thing, but all the planning is not. My therapist has told me that she never views a client talking about suicide as "just looking for attention." She views it as the client saying "I'm in this much pain and I don't know how to cope." Looking for attention isn't necessarily a bad thing anyway...it means that you want someone to notice your pain and help you with it.

I will say this - nothing you do will make it easier on your friends and family. My brother took his life 12 years ago. He had it all planned out very well, had disposed of his property, there was very little for the family to do but grieve. It did NOT make it easier. It actually made it harder, because it was so obvious that he'd planned this out, and as his big sister, I'd always watched out for him. I missed all that planning he did, and I STILL feel guilty for missing it. I still feel like I should have noticed, should have seen what was happening with him, should have tried to talk to him or gotten him help or something. That guilt is probably never going to leave me. It has faded over the years, but it's still there, over a decade later.