How To Improve This Transaction

Hello,


I have four different transactions such as below and I do one insert and one update in each transaction and it seem it is slow and creates deadlock with the user interface.

These transactions are performed against the tables that users are accessing with another user interface. I have following two questions:

1. T2.TextField1 and TextField2 = @TextField2 are Ok, Nok fields so I did not put index since only two distinct values. Should I put indexes on these fields?

2. Can I make this transaction let user interface do its task in case accessing the same rows, I can start transaction again but I do not want users get disturbed?
.

BEGIN TRANSACTION pTrans
BEGIN
INSERT INTO T1
(fields)
SELECT (fields)
FROM T2 INNER JOIN View1 ON T2.TrID = View1.MyTableID
WHERE (T2.TextField1 = @TrType AND T2.TextField2 = @TextField2)

UPDATE T2
SET TextField2 = 'Ok', TextField2Date=@MyRunDateTime
FROM T2
WHERE (TextField1 = @TrType AND TextField2 = @TextField2)

IF @@ERROR <> 0
BEGIN
rollback transaction pTrans
return(-1)
END
ELSE
BEGIN
commit transaction pTrans
END
END