I need to replace a front wheel hub, and would like to build the wheel myself, but I'm afraid that I might get the tension wrong... tighten all the spokes to tight or too loose, so even if the wheel is true, it will not be correct ... the problem is that my only reference is my old wheel and there is nobody in my area who can show me... is there any rule of thumb one should abide ? And how critical is this tension - does the correct tension improve the performace greatly ?

Claude