Trust me, I've placed more than my fair share of concrete in my life. If you're doing it by yourself, call a truck and have it delivered. You'll get a much better product due to it being consistent. It's going to take quite a while to mix that amount. I just got done pouring a footing on about 75 feet of fence that took 60 bags. I could mix 2.5 bags at a time, then wheelbarrow it over. I added an additional scoop of Portland cement in for some added strength. I poured it in 8' sections as that's about all the time I had in the evenings after work. I wish I could have gotten a truck where I needed it. What took several weeks to complete could have been knocked out in an easy day.
