I have worked out my birth time to within a 30 min window, using the little knowledge from family, a

[Astrovalley]

I have worked out my birth time to within a 30 min window, using the little knowledge from family, and much from your rising/decan section. Is this accurate enough to get a reading? 

Congrats for your work. However a 30-minute window is risky since the ascendant progresses 1 degree every 4 minutes, meaning it will change some 7 or 8 degrees. This could change the ascendant sign and possibly the sign on the cusps of the other 11 houses; could shift planets to other houses -- might possible move the Moon to another sign, etc. I would not like to take your money and deliver a reading for a horoscope which might not actually be yours. Sorry.