Nice advices above.
All depend of sounds you put in Lead group, but here's tips I always do.
First of all I load Glue compressor on Lead group to connect them as one.
When I EQ my Lead group, I always cut lows (below 150hz), do little shelf to low something near 500hz. Then look at 4-7khz. I put down those freq a little because on stages these frequencies stick out a lil bit. About highs there's options, because if you have white noise, there's no need a eq. White noise gives all nice high freqs for leads.
After you can use C4 (for example) to control all these freq.
Some of your lead must be in center (not full center), and other can be a lil bit wider for make it huge

It's all depends on how you hear your leads and how you want them to hear. Your ears are the best judges to know that leads sounds okay

My process can be totally wrong, but I use this.
Sorry for English