In my experience there are some points should be considered before heading for trekking.Some of them are
1.Age group:In trekking the journey can be completed fast if we have the fit age group as compare to the old

trekkers and child one.
2.Place where you come from: If you are from very low altitude then it will have  more chances of being high

altitude sickness.
3.SEASON:the trekking in nepal should the be  right season.  As you have chosen the middle of the season we can