yeah, try some smaller routes first, el cap is truly massive, photos really don't do it justice. do some shorter aid routes first, like washington column and the NE face o half dome, before you even think about doing mescalito, you might be able to scrape your way up the nose. I really want to get into aid climbing and go to yosemite to climb some big walls, but I wouldn't consider el cap until I have done many other multipitch walls where I could prefect my skills in order to move fast and efficiently. like do the upper town wall routes several times, do WA column, leaning spire, reg route, then zodiac or the salethe. don't rush into stuff, you'll climb longer.