Yes, the violin is the most intricate string instrument. Many consider it not only the hardest string instrument to learn but also as the hardest instrument to learn. The violin is a complex instrument and learning how to play is not easy. The skill curve of the violin also makes it difficult to learn.
Learning how to play a violin depends on your willingness, patience and practice. It takes years to become a master at it.
Do not get discouraged, if you really want to learn how to play a violin, then go for it.
It depends upon the willingness to learn. It could take years of practice to be able to master the violin successfully. You must concentrate and identify the notes and the correct placement of your fingers on the strings. You also have to learn the different bowing gestures. You have to learn how to control the bow and strike the correct string.
A bowed violin string vibrates which can make it complicated to learn. You have to keep practicing until there is a fluid motion. All the string instruments present very different challenges of technique, posture, and stamina. It also largely depends upon the player's ability, motivation, and experience.