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Yes you can @jpinka, give it a try!! It's very therapeutic. You'll get better at it as you go along. Trust me, i learn new things every day to improve my coloring techniques. :)
Tabz has other books out that aren't gray scale. Just search tabz Jones on amazon

Have faith! I've found some great tutorials for grayscale coloring on YouTube. I always send people to Nikki Burnette's channel. She does the tutorials so well, I don't think there is anything I could add =)
https://www.youtube.com/user/NikkiBurnette