You have 2 options.
First is to Jump down to I8 by the Salton Sea (you pick which route is best based on local traffic conditions). Take the 8 to the 10 and the 10 to the 20 into DFW. At DFW, pick whatever route works best based on local traffic conditions to your final destination.
The second option is 10 to Phoenix where as you get into Phoenix, jump onto the newer 202 SOUTH bypass (don't mistakenly take the 202 NORTH which is miles before the 202 South) and get back onto 10 after Phoenix and continue with the 10 to 20 directions.
The first option is what I prefer just because the routes to I8 in CA are not as haggering as the (close to and within) Phoenix metro traffic can get. It also has less traffic overall.
