the most important thing now for Chelsea is to keep winning. The first leg playing at home will certainly be more energy for Chelsea. although it was difficult Chelsea had to get the winning goal. and I hope in the second leg they don't play defensively to stem Real Madrid. instead of aiming for a draw.
Madrid with Benzema's recovery can certainly damage Chelsea's defense and midfield dominance. they have to be careful.
Today both Real and Chelsea played games in economy mode (at least it can be assumed) but Real won and Chelsea lost big. I think now the plans for the upcoming match will be adjusted and Chelsea will think more about defense, and Real about attack - maybe now it is Real that will think about getting an advantage in the first match and not defending a draw.