hehe ... careful, this cycling lark is addictive
!
As you say, your backside needs to get used to cycling, but the wrong saddle can make it very uncomfortable.
Contrary to what may seem logical, a saddle that is too soft can cause more problems than a harder one. This is because you are supposed to sit on your sitbones, and if they sink very deeply into the saddle, the rest of the contact zone rubs with every turn of the pedals.
A further thing to watch out for: depending on your sitbones, the saddle may be too wide or too narrow for them. Many bike shops have a device that measures the distance between the sitbones (like a soft bench you sit down on), and many of saddles come in a range of widths.
If you don't live too far from a bike shop, I wouldn't necessarily wait for 6-8 weeks before asking about saddles. Any local bike shop (often referred to as LBS) worth their salt will be happy to give you advice without you needing to buy anything. Some even have test saddles they loan out, so you can try before you buy! If this isn't available locally, you could also try the
CycleChat saddle library
And finally, some people swear by Brooks saddles (made from leather), which you supposedly "wear in" like old fashioned leather boots (no personal experience) .... but everybody's backside is different, and there is a comfortable saddle for everybody.
Good luck!
T