Extremely hard.
Tedious at times, life draining (still can be at times if it's been a bad night of sleep)
Physically draining, I had a snacker and she would be on and off the breast up to 24 times a day for 10/15 mins each time (she was a snacker for a long time but at around 9/10 months she cut right down to 4 feeds and by 12m just 3. Now at 18m just one in the morning as she enjoys it and doesn't seem to want to stop!)
In the first 4 weeks I thought the sheer pain of breastfeeding would cause me to suffer a mh breakdown, worse than birth as it just goes on and on, I used to dread each feed and considering they were every 45-60 mins that's a lot of dread in a day! (After 6 weeks breastfeeding was so much bloody easier, really enjoyable and lovely, lots of cuddle time and seeing their face smushed against you is sweet)
Stressful as I questioned myself on every aspect of parenting (settled into it now I'm past the whirlwind of regressions, naps, weaning, non mobile or learning to walk, tiny baby/baby phase)
Upsetting as my brain stopped working! I felt so stupid for at least 10 months, luckily I had 12 months Mat leave (my brain is back firing now, and I now have a 2nd job and starting retraining this year)
Sad, lonely, felt that friends just didn't get it. Felt like no one cared (I have lovely friends and amazing family and all my relationships are now stronger than ever. I see friends at least once a week, life is easier. The hormones really affected me! I was sad/happy/anxious/scared/overjoyed all in the space of 5 mins sometimes which is really not me. I am very stable in terms of mh/eh usually, it was a lot to adjust to)
Sheer fear, around 3 months I had the realisation that this was my life now for the next however many months - Feed, change, nap, feed, change, nap, and that my freedom was gone. ( 12 months onward I felt like freedom had opened up a lot and now 18/19m it's much easier, mind you DH is very supportive and does neatly equal)