I completed both the I-130 and I-751 myself and it is not hard. I would suggest that you submit as much proof as possible, bills in both your names, lease/mortgage to show your both listed if possible, bank statements, car insurance with you both listed, life insurance if you have it to show each other as the beneficiary. We also provide lots of pictures from throughout our marriage and some from before, including wedding pictures. If you have pictures with family send it.
My I-751 was received by USCIS on 5/1/2021. We received the I-751 approval on 1/5/2023 without an interview and we got the greencard a week later.
I hope this helps, good luck!