in need of a scheduler for twitter

I am in need of a scheduler for twitter and have no clue what to use. I tried twuffer (not sure I’m spelling it right.) It never posted at all. I set it up like I was supposed to and just never got anywhere with it. I tried buffer and instead of spacing my tweets out like I tried to get it to do it posted them all at once. I go on vacation every year so this means I am not online. I’d like to advertise my YouTube channel while I am away so this is why I am looking in to it. Buffer’s scheduling is just to confusing. I could never get the time to say, 08:00 AM. The time I picked just would not stick at all. hootsuite just refused to post entirely. I have no clue what to do here. I am getting frustrated. Tweetings is out to because the device has to be both on and have an online connection to even post the scheduled tweets. I am sorry my mind is all over the place, my brain is going 90 miles an hour. Then again it always does. haha. Anyway if anyone has any other ideas other than the ones I talked about let me know, please?
All the best, Cat