Mate , I was hoping one of db's free divers would chime-in with some words of wisdom.
But in case they are all busy, I have some concerns to put to you-
You're not doing this on your own are you?
You have a buddy watching your back, right?
Please remember it's your life on the line here.
Free divers always suggest doing a course for newbies, learning to dive safely and hopefully find some buddies to train with, sounds like top advice to me.
Some more thoughts on the equalising thing, try descending feet first with the head uppermost, you may find this easier.
Lil's advice is spot on, any problems and ascend a little bit, try again and don't force anything.
One more thing, in the head down position make sure not to tilt the head back too far, sometimes trying to see the bottom will make you do this,
the trouble is this will constrict the Eustachian tubes and make equalising harder, try to keep your chin towards your chest.
Well that's my equalising knowledge exhausted, more experienced people will hopefully add more.
Please, please be careful and stay safe.
Dave.