What do you do to get to the bookcase part

Hello! I was stuck on this part for so long...ao you see the portait in the library but it wont let you say the password, well thats ot the portait. When they say go to the library don't accultly go in the library. On the side where you enter the library there will be another door labeled library annex or something like that. Enter that. There is about four-six perfect. One at every section you turn so be careful, at the end of that room will be the real portait. Enter there and there will be many book case. When the doors shut behind you keep going straight down the non-light section of bookcases. There will be a ladder, climb that, slide acorss to the other side of the wall. (dont let the books hit you) once you reach the top there will be a door, go in that. If I am right you will enter a room full of bookcases with two floors. On the left you can call hedwig and she will bring down the ladder if you give her a treat on the other side of the room by a door in the chest. Go up the ladder and there will be a walkway above the door. Go that way, not straight across to another book case. Once you our at the last book case before entering the second floor/ balcony, there is a rope where you have to use the scissor spell to go through. Go straight across the book cases and pick up the hogwarts: a history book. A door will open...enter that and tht will lead to another room where you have to defeat a mad bookcase. (use the "hand" spell...filpedno) push the small block to the first book case that is square and climb up on top of the bookcase. Filpedno the books twice and they will fall...ghost will be there too. You will reach another book which is the skurge spell which gets rid of ectoplasm(green slimey stuff) go back to the room where you got the book and go to the right side where you had to climb the ladder. Skurge the door ad go through it and I believe ther will be room with four skurge doors. Cast the spell on them on go inside and push a button. Malfoy will be there. After pushing two buttons you will battle crabbe and once defeated skurge the next two doorways and push the button inside that then you will battle goyle. After defeated go through the door where when you pushed the buttons opened a gold slider thing. Go throught there and push the block up opon the side and climb. Skurge the door way and skurge the lever on both right and left side. Then go down to the door inside the place use lumos and open a secret passage way that leads back to the library I believe and go back to hermione and give her the book. hope it helps!!!