What would you call tech diving? If you are talking about moving onto just basic nitrox diving then that shouldnt pose a problem. However if you are talking about moving immediately into gas switching etc underwater then i strongly urge you to reconsider and get some extensive experience diving in different conditons first. You will be restricted to what tech courses you can do anyway, by the number and type of dives that you have already done. For example in order to take the IANTD Technical diver course you must have at least 150 dives and some of those must be specific types of dives. Maybe you can give us some more info on your exact intentions bridgenet.