How do you actually pick a comfortable saddle?

How is the correct way to ride the saddle? ( i read the post - i dont understand). What is the correct angle for the saddle? Is it affected if you have drops or risers? Are you suopposed to straddle with the tip up your bum??? Crunching your nuts? Is that why there are some without the pointy bit? Are you supposed to carry your weight on your peddles?

I ask this more about long term damage as well as comfort? Obviously comfort should be intuitive but if a courier who does 100s of miles a week says its better to ride one way, it may be better to acustomise a riding style to match that.

Most saddles should start off flat (spirit level flat) And then make micro adjustments if required. I prefer nose up by a degree on most saddles as it keeps me back on the saddle (worse thing for me is any feeling of sliding forwards which puts extra pressure on wrists/hands/arms/shoulders)
Ideally you body should rest across the bike with equal pressure so no single area has to take all pressure. This is easier on a race bike than an upright town bike though!