Chelsea may actually learn to beat Real Madrid from Barcelona but trust me they will only learn to beat the La liga Real Madrid and not the Champions league Real madrid lol. To stop Real Madrid, Chelsea will have to be flawless in their defense, not the kind of defense they put up against Everton because Everton's attack can not be compare to that of Real Madrid.
It's hard to say if chelsea will able to copy barcelona and implement the same strategy as barcelona. It's caused by chelsea not having some capable defenders to do that. you can't even see chelsea's defenders are on the same level as barcelona. Chelsea defenders are very often made so many blunders.
The strategy used by barcelona is to use counter attack against real madrid. The quality of players is also determining how successful the strategy will be implemented. I just remind you how potter was changing the formation at the middle of game against everton to be fully defensive yet chelsea must accept the draw against everton caused by some blunders being made by chelsea defenders. Chelsea was not barcelona.
Chelsea needs also to attack real madrid efficiently. I prefer to see chelsea use the usual formation. As long as potter can learn from the past mistake to did proper substitutions and i guess that chelsea may able to get draw in the first leg.