ROUX IS A *****! lol step 4b in this
http://wafflelikescubes.webs.com/rouxmethod.htm tutorial is kicking my ****ing ass. please please please give me some advice peoples. i always end up with a situation that looks to me nothing even remotely similar to the situations described :/
It's pretty hard to say without a bit more information. Can you post a picture or describe your problem?
I'll offer some generic tips for 4b:
As waffle said, have you oriented all the edges? (Step 4a)
If so, your goal in 4b is to solve the edge pieces for up-left and up-right. Stop for a second, where are they on the cube? Your immediate goal is to move them in some way such that they are opposite each other. This will make them very easy to insert into the correct positions.
Pretty much your worst case is that both are on the top layer, positioned adjacent to each other.
(If you don't have this case, keep reading because we'll get to the case you do have eventually.)
Even this "worst case" isn't that bad, a simple M2 moves the green edge down to the bottom layer. Now we have one on the top layer and one on the bottom. This is progress, as it is very easy to move from this position to our desired sub-goal of positioning the two edges opposite to each other.
At present, you would have something like this:
(NOTE: It's ok to do a U turn to set up your top layer at this point. Also, you might notice that the blue and green edges have 'swapped' positions in this diagram. This is completely trivial, don't worry about it.)
Now, as stated in the tutorial, it's a simple case of M U2 M' to position these two edges opposite each other.
Use the M slice to position your two edges on to the
bottom layer. Hopefully, you can now see that if you correctly position the U layer before performing an M2, your two edges will end up on the top layer, and ideally in the correct positions. An easy mistake to make is the following:
If you find yourself in this situation, perform an M2 to move your two edges to the bottom layer, followed by a U2 to switch around the top layer corners, and finally another M2 to re-position the edges.
I hope that helped. At times, in my description I may have left out some intuitive U turns or near identical cases. Hopefully you can recognise these yourself. I hope that answered any questions you had, let me know if not (with as much detail as possible, pictures would be ideal) and one of us will step in and help you. Good luck! =)