I always say that the first row is the hardest because you have to work into the foundation chains. The best, but hardest, way is to insert your hook in between the two top loops and the one bottom loop of the chain. This method gives the smoothest look to the bottom of your work. If the look of the bottom isn't a factor, then go ahead and just insert your hook into any one or two loops of the chain in making your first row.
If you find that you're a tight crocheter, then working the foundation chains for the first row can really be difficult. So, try using a size or two larger hook than called for in the pattern to chain the foundation and then switch back to the right-sized hook for the first row.