I think it is wise to think carefully before you have children - but I would add my voice to those who say you absolutely can manage without having involved parents who help with childcare, @malfish11.
Both dh's and my parents were still alive when our three dses were born, but we had moved for dh's work, so none of them lived close enough to have offered any child care - and anyway, both dh's parents were still working, and my mum doesn't like small children, so in reality, I doubt they'd have offered.
I built a support network for myself. I did NCT classes and went to NCT groups both before and after the dses came along, and I went to Toddler groups too - and through these, I made some wonderful friends - and we all gave each other a lot of support.
When the dses went to school, I made more friends at the school gate, and my support network grew.
We were able to afford our living expenses on dh's pay, so I was a SAHM, from before ds1's birth until after I had ds2. I did go back to work for about a year, but when I got pregnant with ds3, my take home pay (as a theatre nurse) would have covered the bill for the three of them at nursery, with about £2 left over - so I went back to being a SAHM.
Yes, parenthood is hard work - and if you are a SAHP whose dp works long hours, then a lot of the child care and housework falls on you - but I look at my three sons, who are now 20, 22 and nearly 24, and I am so full of pride in them, and have such joy in knowing them, that I wouldn't have changed a single thing.