Brake bleeding without bleeding block Is it ok to bleed my brake without a bleeding block and without removing the wheel? 

What is the effect on the lever?
Will this result in a less firm lever?
It is not recommended to bleed without removing the wheel as:


It is easy to contaminate your pads with spilt brake fluid
It is likely to result in overfilling your brake system. (resulting in pads not fully retracting and rubbing on disk).


You can make your own bleed block from common household items.
I followed the guide here:
http://www.epicbleedsolutions.com/blog/how-to-make-a-bleed-block/