If you've always wanted to do this and thought it was too difficult or expensive there are many ways you can do it on a budget. Even if you aren't that fit, you can do short treks for a couple of days in Pokhara which is less steep than the Khumbu region. The most expensive part is usually the flight, then after that most things from hotels, guides, and eating are very cheap. Many of the tailor made trips seem expensive, but if you look around you can find local guides for a fraction of the price, and your own hotels and hostels as many are online now and you can book yourself. I do advise going if you love mountains as it is breathtaking, and the people are some of the friendliest on the earth.