Go into the situation with realistic expectations... and you won't be disappointed.
IOW, Don't expect a $500 laptop to deliver the performance of a well configured $2000 tower.
The power-management features for laptops benefit the general-purpose user (greatly extends battery life)... but runs 180 degrees counter to what we're after (maximum performance).
You're looking for a laptop that has low/consistent DPC latency (not to be confused with audio latency).
The general-purpose user won't notice a high DPC latency spike while Surfing the Net... or running Photoshop.
However, that DPC latency spike can prevent audio buffers from being filled in time (causing dropouts/glitches with audio).
The lower the (audio) latency you want to effectively run, the more significant DPC latency becomes.
You'll want to use one of the better USB audio interfaces.
If you don't mind working at ASIO buffer sizes of 256-samples or more, you're odds of success are much greater.
If you have huge performance expectations (especially working at ultra low latency), that's where most laptops fall short.
Also, there's no real upgrade patch with a laptop. You buy it... use it... and ultimately replace the unit as a whole.
For these reasons (unless traveling via plane), I'm not a huge proponent of laptops... so I choose to use a Cube for my live rig. All the speed of a fast tower... with none of the limitation of a laptop.