hey guys im really eager to shave my head but the only razors i can really afford are cheap 2 blade disposable bic razors. would they hurt or cause any damage or should they work fine

I have shaved a few times with a Schick disposable twin blade with mixed results. It comes down to technique and preparation. The last couple of times I went slow and steady with frequent rinsing of the Schick and had satisfactory results - no nicks or cuts. That being said I use a HeadBlade Triple most of the time and just threw the Schick in for kicks to see how it would work. I know the question was about bic specifically but I feel the Schick comes close enough for a comparison. IMHO

thank you for your detailed reply this is only to last me until next month when i can purchase a head blade im just so eager to shave it off i cant wait

I agree with others, cheap blades = poor results
You say you will purchase a Headblade, well there are several blades you can use on the HB, I would recommend the Sensor or Excel but have tried cheaper ones like the Personna Twin Pivot Plus. They give a decent shave but don't last very long, but given their price........
There are lists in this forum with blades to be used with the HB

Get a Mach 3 or a fusion and sharpen the blades.Right now I am on day 70 with my current fusion blade and I shave every day.Sharpen it using the blue Jean method and keeping the blade dry when your done shaving.

Cheap razors yield poor results.

Nothing more need be said.