That, ironically, is the same method people skilled in writing naturally have used.
They frequently check with a dictionary or thesaurus. They do it on a as needed basis however with the skill of photoreading you may expose yourself to these books more frequently over a shorter period of time and can expect the benefit of having you're writing skills improve whereas they had to do it without realising that they were gaining knowledge over a period of months and perhaps years.
Afterall isn't the most valuable books in a profient writers bookshelf, their 3 to 6 dictionaries (less they missplace one) and at least one thesaurus?
Alex