Practise

Okay now I can easily solve one layer without reference because it's easy to grasp the concept.

For the second & third layers and final face, still I need to refer to the solutions because can't memorize the various sequences. Eg: If X is where and where, do this this this this this. If Y & Z is where and where, do this this this this this and this. If you need to swop from right to left, do this this this and this. That kind of sequences I can't memorize. 

So I teach you the first few steps ok?

Set-up

First, form a "Daisy", that is-- Yellow centerpiece, four white petals (tip, sides, bottom). 

Next, look at the side colour of one petal, turn the top layer to find a center piece match for the side colour. Eg: see the Orange side colour of the petal? turn it till you find a Orange center piece. Turn right layer 180 degs. (quarter turns X 2). Do the same for three remaining petals. You will end up with a White cross at the bottom of the cube. Turn it up and check that the side colour of the petals have matching centerpieces. Okay now you've set-up the stage and next objective is to get an All-White face. 

Step One - All White Face

Look out for every white square at the bottom corner of cube. Work on one cube at a time, turn the centerpiece to match the side colour of the bottom white square. Then bring it up from bottom to top. 

If you've got a white square on the top layer side, bring it down to the bottom before matching it to its centerpiece and then bring it back up. Do this until all four corners are back up, when you've formed an All-White face using this method, the first layer will naturally be solved. 

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Anyway, if you are keen, just check out Rubik's website for the Solution Guide.