Adolescent puppy help!

Puppy is 10 months old. There's a few behaviours I'm struggling with.

• his loose lead walking. I've been doing the method of changing direction every time he goes to walk ahead of me and giving him treats when he engages or walks to heal. I've been doing this day in day out for weeks now and seen no improvement. He pulls, lunges forward to get to where he wants. We can barely make it past the drive before he starts pulling forward or lunging. When he was a puppy, I felt like we were making progress and its gotten worse now.

• He's reactive to people and dogs on a walk and wants to say hello to everyone. He will lunge or try to run forward to greet people and dogs. Ive tried making him sit and giving him treats or throwing treats to distract him. Sometimes it works, most times he's focuses and locks in, will end up on his hind legs and tried to run and lunge at them.

• mouthy behaviour. I can't seem to sit on the sofa without him getting overwhelm/ over excited and mouthing me. He always grabs my hands and pulls them towards him. Sometimes he'll grab my clothes. I have tried saying no firmly, getting up, ignoring him, and walking away but he still continues to be mouthy no matter what. Redirecting to a toy doesn't work and he just wants my hands.

Edit: Blankets, he goes crazy for Blankets and pulls all blankets off the sofa to run round the house with. No Blankets are safe if he's bored and has no distractions. The Blankets are there to save the cream sofa and he just pulls them off and plays with them.

Please help because otherwise he's a very well behaved and smart dog. I can barely get his physical energy out due to not being able to go on longer walks with him as the trainers say to keep it in a familiar place and work out further. I'm never going to leave mt driveway at this rate. And I just want to chill on my sofa without being mouthed.