Download CoreTemp to monitor your temps. You generally shouldn't go over 50C under full load. You won't need any extra programs aferwards, but you have to keep track of your temperature.
Sweet you got the hang of it now. Just remember, 19.5 multiplier for 3.9ghz, and 20 multiplier for 4.00ghz. Your on water so 4.00ghz 24/7 should be attainable.
No problem, I love seeing big numbers lol. You should be able to hit 4.00ghz. Just remember to monitor temps though and keep away from high Cpu voltages. Other then that, overclocking is only a win win situation.