Brilliant that you are thinking this through, OP, well in advance of acting on your thoughts. I thought and planned for 6 yrs whilst also looking for Mr Right and also effectively working 2 jobs - employed and self-employed - to raise enough funds if I did decide to go for it alone and also to have a stable financial foundation.
I have twin 10 yr olds now - 16 yrs on from my initial thinking about it. Hardest thing I've ever done and also the most rewarding.
Hard bits: Virtually no 'me' time for 10 yrs + now. I do parenting/working/domestic tasks...no TV for 10 yrs, no evenings, no social life except that precipitated by friends of my DCs and their mums. No dating. First 5 yrs - no sleep...they didn't sleep through the night till they were about 5. Lost several 'friends' along the way. Made others though...Both my parents died within the first few yrs of my DCs lives and have had no family available to help in any way at all so all help is paid for. It's getting harder now rather than easier as my DCs needs become more complex and no time to spend quality time one-to-one with each.
Not hard bits: So far, no problems at all for DCs with me being solo mum by choice. They've never NOT known the full story and everyone meaningful to them has also always known. I chose an Identity release USA donor as in those days UK donors were anonymous and in the USA, you could get loads of info about the donor and he's willing to release his identity when offspring are 18 and maybe meet them. We're in touch with several other families who used the same donor. So far, neither DC is all that interested in half-sibs of donor father but if this changes in time, they can get more info. Both are adamant they'd HATE our family set-up to change. They've never known a father so never missed having one.
Good bits: It's always felt completely and utterly 'right' and 'natural' to have DCs, to me, instead of living a more 'self' orientated life, as you can before you have DCs. There are of course some exquisite moments of happiness with them and infinite feelings of love. There are also many impossibly hard moments. But the enduring feeling is one of 'rightness'...difficult to describe really. Just feels right to me that a significant purpose of life (a v personal opinion) is to pass on love and wisdom and care to the next generation, and this makes facing mortality much easier.
That might sound strange as I'd imagined the good bit would be moments of gazing into my babies' eyes in adoration. Howevere, I barely ever had time for that bit! It's the sense of 'rightness' that sustains me through all times.
Only rarely do I sense disapproval from others - more so recently, as my DCs social contacts increase and people who don't really know me, obviously 'find out on the grapevine' that I used a donor and maybe disapprove or are shocked or have strong religious beliefs against this way of becoming a parent.
I could do with more time, more money, more help - but I don't think this is related solely to solo parenting and is a feeling shared by my married friends. It does get to me sometimes that some SAHM friends could generate more income, if they worked whereas, as the sole adult in our home - there's only so much I can do to make money and also cover the domestic side of life. But I took responsibility to parent alone so I accept the consequences.
Much harder, I would think, if I'd loved and lost a partner and this had then disrupted my DCs lives.
Your profession should allow you a good set-up to make this work, as you can get school holidays off etc. I have to juggle work (fully self-empoyed since having my twins) and expensive clubs/activities to get through the 9 weeks summer hols and other hols and also take time off with the DCs too without losing out on too much income.
Keep thinking. Ask yourself, if I were now aged 50...60....70 and had never had children, would I still be satisfied with the life I've lived? I think the word 'satisfaction' or 'contentment' is more relevant than 'happiness' which can be fleeting. I'm sometimes happy, sometimes unhappy, sometimes ecstatic, sometimes in despair and frustration, as a parent - but the enduring sense of 'rightness' and deep 'contentment' with my lot, is what sustains me...
...and now, I've finished the only time for 'me' of the day, as DT2 has been stirring next door since 4.45am and clearly wants me up now! So better stop! Good luck!