@Thesexier If there are that many difficult words in the fist 6 lines, you probably have picked too difficult a book. You’ll end up reading the dictionary more than the book itself, and you’ll hate the book. Better to pick a book with a storyline you can understand, and a new word every few pages or chapters.
One good way to increase your vocabulary is to pick a word you don’t know, and use it 3 or more times in a day. This means you’ll be on the watch for ways to legitimately use it in conversation, and you’ll be thinking all that while about what it means, how to pronounce it, and so on. You will also need to learn its synonyms, so you can spot when it is appropriate to use your word. This is really effective.