▲你的句子是正确的:这里的 had need 是一种旧式用法,意思是“应该”,其后接不定式(不定式通常省略to,但带 to 也不算错,只是比较少见而已),所以你的句子说成 You had need to go there yourself. 也是可以的。又如:
You had need hire men to chip it all over artistically. 你应该雇人手在上面都刻上有美感的图案。
▲注意:这样用的 had need 从形式上是过去时态,但其实是表示现在。类似的如 had better(最好;其后只能接动词原形)。如:
You had better go there yourself.