Hi, few more details please?
Don't need more details. I read the question as a general ask for suggested techniques.
The fact is that when you get back before registration you are reliant on what details can be found in church documents, plus other useful sources. As Kevwood says, if you have two (to take your example) William Hunt born around the same time, you presumably have their fathers' (and mothers'?) names, then if you find a William Hunt son of X getting married that may well be the same one. If that's not the marrriage of your ancestor, it increases the chances that the other Willliam is yours.
Next you might find some wills. Either a will of one of these characters, or someone else who mentions the target person perhpas as a beneficiary. That record might give his parent or sibling's name(s) which helps narrow down the options.
And as you have already tried, someone born in the 1790s might still be living in 1851 (or somewhat less useful 1841) and be listed in the census with family members. Or if not they might have a burial record although many of these don't give age, parentage or anything else useful.
Others will no doubt mention some other techniques.
The fact is, you are much less likely to ever be certain of the parentage of a William Hunt (or a Mary Smith) than an ancestor called Josiah Wiveliscombe or whatever.
