How hard is it to quit smoking?

I’m planning on quitting starting Aug 21st. My reason is so i can live longer for my child, plus he has asthma and i don’ t want the cigarette smoke in my clothes anymore when he breathes it in. Another reason is gas prices are so high now and between gas prices and buying cigarettes i spend at least -0 a month. This will be my first time ever doing this, i don’t even know how to quit or avoid the cravings. I really can’t afford the smoking cessation classes (don’t know if i spelled the word right lol) i just want to do it on my own. I already know that the nicotine gum won’t work because i already chew gum when i’m smoking a cigarette. Need advice please and thank you to all!
I have people that will support me, like my boyfriend (he wants me to quit also), co-workers, my mom said she’ll support me but she smokes too and i live with her, i know other family members will be willing to help me.