Baby sleeping

Hi I want to ask how did your train your 1 month old to sleep on his or her own? My baby is 1 month 20 days and I have been training her to sleep on her own with techniques like swaddle,keep room dark, let her self soothe, pacifier, but still she can't sleep well in the night. It's really tiring as a mum and I can't sleep in the night also, cos I will be thinking when will she start crying again. Wonder how do your cope and do your feel the same way as me.. hope your can give me some encouraging advice . Thanks! I keep telling myself to hang in there but really I need to voice out sometimes .