Check out Tadashimori's video's on Youtube. (I think he runs Gifts Beauty)
His origamis are AWESOME.
The letter folding is very simple :]
I'll explain each in 3 steps
Step 1: Style #1
But if it helps, I'd like to say that the red lines represent valley folds, and the green ones are mountain folds.
Step 2: Style 1: step 1
Open the paper.
Fold one corner along the crease.
Turn the paper around and do the same with the other corner
(The pictures explain better than my words o.o)
Step 3: Style 1: step 2
Do the same to the other side.
Step 4: Style 1: step 3
And YOU'RE DONE
Step 5: Style #2: "pull"
I didn't make a cp for this one (didn't really think anyone would care)
I've given up on cps after I tried the one for the first style
Step 6: Style 2: step 1
Open it up.
Bring all four corners toward the crease.
Fold both edges toward the crease also.