There will be lines every where some things you can do
try to go before you get in to any line
get to the park at opening where the lines are shorter
book your FP for rides you want to go on that have longest waits ( I find lines start to get long around 60 to 90 minutes after park opens so book your first FP then the other 2 right after)
Maybe go back and rest after you use your FP if you are feeling tierd, the end of the day the lines are often shorter and depending on here you go the park maybe opened quiet late.
after your use your 3 FP look to see what other FP you can get.
I have heard touring plans really helps with lines so maybe down load it ( I think there is a fee, but I heard you can find a scout code,) I have heard of people getting this and they never waited in a long line.
You can go to GR and talk to a CM about your needs that you have in line, they maybe able to help you. They may ( and I do mean MAY) give you a
DAS card where you can wait out side the line, but I have heard that some people with UC and other similar thing were told no, but if you feel you may need it then ask.
but even if you do get one there will still be lines since it dose not work every where, so having a good back up plan.
If you find you have to lave the line, you can do one of two things, if someone is with you and you know you can go and come back you can do this, if you can not go and come back have the person you are with talk to the CM, as you go to the bathroom and explain your need that you had to leave often times they will give you a card to come back so you do not have to wait in lines again. ( not aways but some times they will)
Hope this helps.