iPhone init method issue

I created a property for the NSArray which creates a getter/setter. I know Apple recommends using the instance variable in the init and dealloc method. I'm trying to figure what to do in the following code.

(1) Do I need an extra release statement? Wouldn't array have a retain count of 2 then 1 with the dealloc, leave a leak. Or would autorelease take care of this?

(2) Is there some way in xCode or instruments to follow a specific variable to see its retain count going through the process.

@property (nonatomic, retain) NSArray *array;
 
 @synthesize arrary = _array;
 
 - (id)initWithNibName:(NSString *)nibNameOrNil 
                bundle:(NSBundle *)nibBundleOrNil 
         initWithArray:(NSArray *)array
 {
     self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
     if (self) {
 
         _array = [[NSArray alloc] initWithArray:array];
 
     }
     return self;
 }
 
 - (void)dealloc
 {
     [_array release];
 
     [super dealloc];
 }
 

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