The best way now is using uxstyle for running as a unsigned services.
the offical site is down thought,so here a copy for you:
http://fyels.com/Qsz

unless your laptop are like 5 years old and only have 256 mb ram then no,it won't,
Rainmeter have more resource on those days,while samurize is more like DIY kind of type,so pick rainmeter if you are just starting.

Yeah,that will do.
Do remind that oyu would don't want to have too many rainmeter on your desktop and all you used is the clock...it would be too much of waste when you don't even need those shiny shortcut

http://pastebin.com/W0SsUtEH
Super fancy HTML version:
http://ricing.co.nf/