You can use a drop checker to make using CO2 for the first time much less threatening. If you use low to medium light intensity you don't gain that much from using the magic 30 ppm of CO2. But, using around 10 ppm or less still gives you a big improvement in plant growth and health. To achieve this, just use 1 dKH water in the drop checker instead of the usual 4 dKH water. That makes the drop checker color be green at about 10 ppm of CO2, and yellow at about 30 ppm. So, all you have to do is keep the color between green and yellow, very easy to do. If you do this with DIY CO2 you can avoid most of the BBA problems that often come with DIY CO2 by also dosing "Metricide 14 day"(very cheap) at about 1 ml per 10 gallons of tank water. Now, your CO2 will last much longer, your costs will still be low, and your plants will do much better.