Hmm, to answer your question, I don't think there's any distinction in "difficulty" between clit and g-spot toys- it all really depends on what type of stimulation you enjoy. Some women prefer clitoral stimulation, while others may prefer g-spot stimulation.
Could you perhaps give us more information, such as whether you are a virgin, whether you have experience in playing with sex toys?
I think a clitoral vibe is best to start with. not all women like gspot vibes because maybe they don't like their spot to have vibration, or some women just don't particularly like penetration. It just depends on what you like, but if you're new to toys, can't go wring with a clit vibe.
I used to only be able to orgasm from clitoral stimulation until my husband bought me the Hitachi Wand with a g-spot attachment. Now I love, love, love g-spot stimulation. It leaves me weak and shaking all over and oh, so satisfied!